UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2011

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission file number 1-10239

PLUM CREEK TIMBER COMPANY, INC.

(Exact name of registrant as specified in its charter)

Organized in the State of Delaware I.R.S. Employer Identification No. 91-1912863

999 Third Avenue, Suite 4300

Seattle, Washington 98104-4096

Telephone: (206) 467-3600

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2) has been subject to such filing requirements for the past 90 days.

Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company.

Large accelerated filer  x        Accelerated filer    ¨        Non-accelerated filer  ¨        Smaller reporting company  ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes  ¨    No   x

The number of outstanding shares of the registrant’s common stock, as of April 25, 2011 was 161,933,056.

PLUM CREEK TIMBER COMPANY, INC.

QUARTERLY REPORT ON FORM 10-Q

For the Quarter ended March 31, 2011

TABLE OF CONTENTS

PART I – FINANCIAL INFORMATION
Item 1.	Financial Statements
	PLUM CREEK TIMBER COMPANY, INC.	3
	PLUM CREEK TIMBERLANDS, L.P.	16
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	28
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	38
Item 4.	Controls and Procedures	39
PART II – OTHER INFORMATION
Item 1.	Legal Proceedings	39
Item 1A.	Risk Factors	39
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	40
Item 6.	Exhibits	41
INDEX TO EXHIBITS		41

PART I – FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

PLUM CREEK TIMBER COMPANY, INC.

CONSOLIDATED STATEMENTS OF INCOME

(UNAUDITED)

	Quarter Ended March 31,
(In Millions, Except Per Share Amounts)	2011		2010
REVENUES:
Timber	$	141	$	151
Real Estate		62		99
Manufacturing		67		60
Other		5		7
Total Revenues		275		317
COSTS AND EXPENSES:
Cost of Goods Sold:
Timber		107		109
Real Estate		22		35
Manufacturing		61		54
Other		—		—
Total Cost of Goods Sold		190		198
Selling, General and Administrative		28		29
Total Costs and Expenses		218		227
Other Operating Income (Expense), net		3		5
Operating Income		60		95
Equity Earnings from Timberland Venture		14		14
Interest Expense, net:
Interest Expense (Debt Obligations to Unrelated Parties)		21		20
Interest Expense (Note Payable to Timberland Venture)		14		14
Total Interest Expense, net		35		34
Income before Income Taxes		39		75
Provision (Benefit) for Income Taxes		1		(1	)
Income from Continuing Operations		38		76
Gain on Sale of Properties, net of tax		—		11
Net Income	$	38	$	87
PER SHARE AMOUNTS:
Income from Continuing Operations – Basic	$	0.23	$	0.47
Income from Continuing Operations – Diluted	$	0.23	$	0.47
Net Income per Share – Basic	$	0.23	$	0.54
Net Income per Share – Diluted	$	0.23	$	0.54
Dividends Declared – per Common Share Outstanding	$	0.42	$	0.42
Weighted-Average Number of Shares Outstanding
– Basic		161.8		162.9
– Diluted		162.1		163.1

See accompanying Notes to Consolidated Financial Statements

3

PLUM CREEK TIMBER COMPANY, INC.

CONSOLIDATED BALANCE SHEETS

(UNAUDITED)

(In Millions, Except Per Share Amounts)	March 31, 2011			December 31, 2010
ASSETS
Current Assets:
Cash and Cash Equivalents	$	254		$	252
Accounts Receivable		32			21
Taxes Receivable		4			2
Inventories		52			49
Deferred Tax Asset		8			7
Assets Held for Sale		38			57
Other Current Assets		15			22
		403			410
Timber and Timberlands, net		3,398			3,405
Property, Plant and Equipment, net		144			146
Equity Investment in Timberland Venture		187			201
Deferred Tax Asset		6			10
Investment in Grantor Trusts (at Fair Value)		37			35
Other Assets		42			44
Total Assets	$	4,217		$	4,251
LIABILITIES
Current Liabilities:
Current Portion of Long-Term Debt	$	45		$	94
Line of Credit		215			166
Accounts Payable		30			25
Interest Payable		26			23
Wages Payable		8			23
Taxes Payable		10			12
Deferred Revenue		20			25
Other Current Liabilities		9			7
		363			375
Long-Term Debt		1,643			1,643
Note Payable to Timberland Venture		783			783
Other Liabilities		75			76
Total Liabilities		2,864			2,877
Commitments and Contingencies
STOCKHOLDERS’ EQUITY
Preferred Stock, $0.01 Par Value, Authorized Shares – 75.0, Outstanding – None		—			—
Common Stock, $0.01 Par Value, Authorized Shares – 300.6, Outstanding (net of Treasury Stock) – 161.9 at March 31, 2011 and 161.6 at December 31, 2010		2			2
Additional Paid-In Capital		2,252			2,243
Retained Earnings		21			51
Treasury Stock, at Cost, Common Shares – 26.2 at March 31, 2011 and 26.2 at December 31, 2010		(912	)		(911	)
Accumulated Other Comprehensive Income (Loss)		(10	)		(11	)
Total Stockholders’ Equity		1,353			1,374
Total Liabilities and Stockholders’ Equity	$	4,217		$	4,251

See accompanying Notes to Consolidated Financial Statements

4

PLUM CREEK TIMBER COMPANY, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(UNAUDITED)

	Three Months Ended March 31,
(In Millions)	2011			2010
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$	38		$	87
Adjustments to Reconcile Net Income to Net Cash Provided By Operating Activities:
Depreciation, Depletion and Amortization		22			24
Basis of Real Estate Sold		19			32
Equity Earnings from Timberland Venture		(14	)		(14	)
Distributions from Timberland Venture		28			28
Deferred Income Taxes		3			1
Gain on Sale of Properties and Other Assets		—			(11	)
Deferred Revenue from Long-Term Gas Leases (Net of Amortization)		7			8
Working Capital Changes		(30	)		(32	)
Other		3			6
Net Cash Provided By Operating Activities		76			129
CASH FLOWS FROM INVESTING ACTIVITIES
Capital Expenditures (Excluding Timberland Acquisitions)		(12	)		(13	)
Proceeds from Sale of Properties and Other Assets		—			11
Net Cash Used In Investing Activities		(12	)		(2	)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends		(68	)		(68	)
Borrowings on Line of Credit		245			568
Repayments on Line of Credit		(196	)		(568	)
Principal Payments and Retirement of Long-Term Debt		(49	)		(53	)
Proceeds from Stock Option Exercises		7			—
Acquisition of Treasury Stock		(1	)		(1	)
Net Cash Used In Financing Activities		(62	)		(122	)
Increase (Decrease) In Cash and Cash Equivalents		2			5
Cash and Cash Equivalents:
Beginning of Period		252			299
End of Period	$	254		$	304

See accompanying Notes to Consolidated Financial Statements

5

PLUM CREEK TIMBER COMPANY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

Note 1. Basis of Presentation

General. When we refer to “Plum Creek,” “the company,” “we,” “us,” or “our,” we mean Plum Creek Timber Company, Inc., a Delaware Corporation and a real estate investment trust, or “REIT,” and all of its wholly-owned consolidated subsidiaries.

The consolidated financial statements include all of the accounts of Plum Creek and its subsidiaries. At March 31, 2011, the company owned and managed approximately 6.7 million acres of timberlands in the Northwest, Southern, and Northeast United States, and owned eight wood product conversion facilities in the Northwest United States (two of which have been indefinitely curtailed). Included in the 6.7 million acres are approximately 1.05 million acres of higher value timberlands, which are expected to be sold and/or developed over the next fifteen years for recreational, conservation or residential purposes. In addition, the company has approximately 300,000 acres of non-strategic timberlands, which are expected to be sold in smaller acreage transactions over the near and medium term. In the meantime, all of our timberlands continue to be managed productively in our business of growing and selling timber.

Plum Creek has elected to be taxed as a REIT under sections 856-860 of the United States Internal Revenue Code and, as such, generally does not pay corporate-level income tax. However, the company conducts certain non-REIT activities through various taxable REIT subsidiaries, which are subject to corporate-level income tax. These activities include our manufacturing operations, the harvesting and selling of logs, and the development and/or sales of some of our higher value timberlands. Plum Creek’s overall effective tax rate is lower than the federal statutory corporate rate due to Plum Creek’s status as a REIT.

Intercompany transactions and accounts have been eliminated in consolidation. All transactions are denominated in United States dollars.

The consolidated financial statements included in this Form 10-Q are unaudited and do not contain all of the information required by U.S. generally accepted accounting principles to be included in a full set of financial statements. The consolidated balance sheet at December 31, 2010 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. The audited financial statements in the company’s 2010 Annual Report on Form 10-K include a summary of significant accounting policies of the company and should be read in conjunction with this Form 10-Q. In the opinion of management, all material adjustments necessary to present fairly the results of operations for such periods have been included in this Form 10-Q. All such adjustments are of a normal and recurring nature. The results of operations for interim periods are not necessarily indicative of the results of operations for the entire year.

6

PLUM CREEK TIMBER COMPANY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

Note 2. Earnings Per Share

The following table sets forth the reconciliation of basic and diluted earnings per share for the quarters ended March 31 (in millions, except per share amounts):

	Quarter Ended March 31,
	2011		2010
Income from Continuing Operations	$	38	$	76
Gain on Sale of Properties, net of tax		—		11
Net Income Available to Common Stockholders	$	38	$	87
Denominator for Basic Earnings per Share		161.8		162.9
Effect of Dilutive Securities – Stock Options		0.3		0.2
Effect of Dilutive Securities – Restricted Stock, Restricted Stock Units and Value Management Plan		—		—
Denominator for Diluted Earnings per Share – Adjusted for Dilutive Securities		162.1		163.1
Per Share Amounts – Basic:
Income from Continuing Operations	$	0.23	$	0.47
Gain on Sale of Properties, net of tax	$	—	$	0.07
Net Income	$	0.23	$	0.54
Per Share Amounts – Diluted:
Income from Continuing Operations	$	0.23	$	0.47
Gain on Sale of Properties, net of tax	$	—	$	0.07
Net Income	$	0.23	$	0.54

7

PLUM CREEK TIMBER COMPANY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

Under the company’s Stock Incentive Plan, the company grants restricted stock units, which prior to vesting, are

entitled to non-forfeitable cash payments equal to dividends paid on the company’s common shares. These awards are considered participating securities for purposes of computing basic and diluted earnings per share.

Antidilutive options were excluded for certain periods from the computation of diluted earnings per share because the exercise prices of the options were greater than the average market price of the common shares. Antidilutive options were as follows for the quarters ended March 31 (shares in millions):

	Quarter Ended March 31,
	2011		2010
Number of Options		0.9		1.8
Range of Exercise Prices	$	41.55 to $43.23	$	33.75 to $43.23
Expiration on or before		February 2021		February 2020

Note 3. Inventory

Inventories, accounted for using the lower of average cost or market, consisted of the following (in millions):

	March 31, 2011		December 31, 2010
Raw Materials (primarily logs)	$	11	$	12
Work-In-Process		2		1
Finished Goods		28		24
		41		37
Supplies		11		12
Total	$	52	$	49
Note 4. Timber and Timberlands Timber and Timberlands consisted of the following (in millions):
	March 31, 2011		December 31, 2010
Timber and Logging Roads, net	$	2,257	$	2,261
Timberlands		1,141		1,144
Timber and Timberlands, net	$	3,398	$	3,405

8

PLUM CREEK TIMBER COMPANY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

Note 5. Property, Plant and Equipment

Property, Plant and Equipment consisted of the following (in millions):

	March 31, 2011			December 31, 2010
Land, Buildings and Improvements	$	84		$	84
Machinery and Equipment		312			309
		396			393
Accumulated Depreciation		(252	)		(247	)
Property, Plant and Equipment, net	$	144		$	146

Note 6. Borrowings

Debt consisted of the following (in millions):

	March 31, 2011			December 31, 2010
Variable Rate Debt
Term Credit Agreement (A)	$	350		$	350
Revolving Line of Credit (B)		215			166
Fixed Rate Debt
Senior Notes		1,338			1,387
Note Payable to Timberland Venture		783			783
Total Debt		2,686			2,686
Less: Current Portion of Long-Term Debt		(45	)		(94	)
Less: Line of Credit		(215	)		(166	)
Long-Term Portion	$	2,426		$	2,426

(A) As of March 31, 2011, the interest rate on the $350 million term credit agreement was 0.74%.

(B) As of March 31, 2011, the weighted-average interest rate for the borrowings on the line of credit was 1.92%. As of March 31, 2011, we had $215 million of borrowings and $3 million of standby letters of credit outstanding; $382 million remained available for borrowing under our $600 million line of credit. As of April 1, 2011, all of the borrowings outstanding under our line of credit were repaid.

9

PLUM CREEK TIMBER COMPANY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

Note 7. Stockholders’ Equity

The changes in the company’s stockholders’ equity accounts were as follows during the first three months of 2011 (in millions):

	Common Stock												Accumulated Other Comprehensive Income (Loss)
	Shares		Dollars		Paid-in Capital		Retained Earnings			Treasury Stock						Total Equity
January 1, 2011		161.6	$	2	$	2,243	$	51		$	(911	)	$	(11	)	$	1,374
Net Income								38									38
Other Comprehensive Income (Loss), net of tax														1			1
Total Comprehensive Income																	39
Dividends								(68	)								(68	)
Stock Option Exercises		0.2				7											7
Shares Issued under Stock Incentive Plans		0.1		—		—											—
Share-based Compensation						2											2
Common Stock Repurchased		—		—							(1	)					(1	)
March 31, 2011		161.9	$	2	$	2,252	$	21		$	(912	)	$	(10	)	$	1,353

Note 8. Fair Value Measurements

Assets and Liabilities Measured at Fair Value on a Recurring Basis. The company’s fair value measurements of its financial instruments, measured on a recurring basis, are categorized as Level 1 measurements under the fair value hierarchy in the Accounting Standards Codification. A Level 1 valuation is based on quoted prices in active markets at the measurement date for identical unrestricted assets or liabilities. Summarized below are the Level 1 assets reported in the company’s financial statements at fair value, measured on a recurring basis (in millions):

	Balance at March 31,  2011		Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets of Identical Assets (Level 1 Measurements)
Cash Equivalents (A)	$	250	$	250
Available-for-Sale Securities (B)		32		32
Trading Securities (B)		5		5
Total	$	287	$	287

10

PLUM CREEK TIMBER COMPANY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

	Balance at December 31, 2010		Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets of Identical Assets (Level 1 Measurements)
Cash Equivalents (A)	$	249	$	249
Available-for-Sale Securities (B)		30		30
Trading Securities (B)		5		5
Total	$	284	$	284

(A) Consists of several money market funds and is included in the $254 million and $252 million of Cash and Cash Equivalents in the Consolidated Balance Sheets at March 31, 2011 and December 31, 2010, respectively.

(B) Consists of several mutual funds and is included in Investment in Grantor Trusts in the Consolidated Balance Sheets at March 31, 2011 and December 31, 2010. At March 31, 2011, investments in these mutual funds were approximately 50% in domestic (U.S.) equities, 20% in international equities and 30% in debt securities.

Available-for-Sale Securities. Certain investments in the grantor trusts relate to the company’s non-qualified pension plans and are classified as available-for-sale securities. The company has invested in various money market, debt and equity mutual funds and plans to use these investments to fund its non-qualified pension obligations. Unrealized holding gains and losses are included as a component of accumulated other comprehensive income. The company records changes in unrealized holding gains and losses in Other Comprehensive Income, unless an other than temporary impairment has occurred, which is then charged to expense. Changes in the fair value of available-for-sale securities were not material to the company’s financial position or results of operations.

Trading Securities. Certain investments in the grantor trusts relate to the company’s deferred compensation plans and are classified as trading securities. Deferred compensation amounts are invested in various money market, debt and equity mutual funds. The company plans to use these investments to fund deferred compensation obligations. Realized gains and losses and changes in unrealized gains and losses (and a corresponding amount of compensation expense) are recognized in the company’s Consolidated Statements of Income. Deferred compensation obligations are included in Other Liabilities and were $5 million at March 31, 2011 and $5 million at December 31, 2010. Changes in the fair value of trading securities were not material to the company’s financial position or results of operations.

Other Instruments. The carrying amount of notes receivable approximates fair value due to the short-term maturities of these instruments. The estimated fair value of the company’s debt was approximately $2.83 billion at both March 31, 2011 and December 31, 2010, and the carrying amount was $2.69 billion at both March 31, 2011 and December 31, 2010. The fair value of the company’s Public Debt (publicly issued Senior Notes) is estimated using market quotes. The fair value of the company’s Private Debt (Senior Notes with various maturities and fixed interest rates which are privately placed with various lenders) is estimated using the same rates adjusted for the different maturities. The fair value of the company’s Note Payable to Timberland Venture is estimated using the same rates as the Public Debt adjusted by an estimated risk premium for holding company debt and the different maturity. The fair value of our Term Credit Agreement was determined by adjusting the spread over LIBOR to a current market spread for comparable debt.

11

PLUM CREEK TIMBER COMPANY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis. There were no fair value measurements of assets or liabilities measured on a nonrecurring basis during the three-month periods ended March 31, 2011 and 2010.

Note 9. Employee Pension Plans

The components of pension cost were as follows for the quarterly periods ended March 31 (in millions):

	Quarter Ended March 31,
	2011			2010
Service Cost	$	2		$	2
Interest Cost		2			2
Expected Return on Plan Assets		(2	)		(2	)
Total Pension Cost	$	2		$	2

Note 10. Commitments and Contingencies

Contingencies. The company is subject to regulations regarding forest, harvest and manufacturing practices and is, from time to time, involved in various legal proceedings, including environmental and regulatory matters, incidental to its business. Reserves have been established for any probable losses.

Unrecorded Contingencies. Management currently believes that resolving pending legal proceedings against the company, individually or in aggregate, will not have a material adverse impact on our financial position or results of operations. However, these matters are subject to inherent uncertainties and management’s view on these matters may change in the future. Were an unfavorable final outcome in one or multiple legal proceedings to occur, there exists the possibility of a material adverse impact on our financial position and the results of operations for the period in which any unfavorable outcome becomes reasonably estimable.

Note 11. Variable Interest Entities

On October 1, 2008, the company contributed 454,000 acres of timberlands located in its Southern Resources Segment to Southern Diversified Timber, LLC (“the Timberland Venture”) in exchange for a $705 million preferred interest and a 9% common interest valued at $78 million. The Timberland Venture’s other member, an affiliate of The Campbell Group LLC, contributed $783 million of cash in exchange for 91% of the Timberland Venture’s common interest. Following the contribution, the company borrowed $783 million from the Timberland Venture (“Note Payable to Timberland Venture”). The company accounts for its interest in the Timberland Venture under the equity method of accounting.

The Timberland Venture is a variable interest entity. The primary operating activities of the Timberland Venture consist of owning timberlands and entering into harvesting contracts with an affiliate of the other member. Besides quarterly interest payments on the Note Payable to Timberland Venture, the company has not provided financing or other support to the venture. The venture is financed by a $15 million line of credit obtained by the Timberland Venture.

12

PLUM CREEK TIMBER COMPANY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

We are not the primary beneficiary of the Timberland Venture. The company does not manage the day-to-day operations of the Timberland Venture, it has only limited protective rights and its involvement is generally limited to receiving distributions on its preferred and common interests. We are not the primary beneficiary because we do not direct the activities that most significantly impact the Timberland Venture’s economic performance. We believe that the activities that most significantly impact the Timberland Venture’s economic performance include managing the timberlands along with the timing and extent of the harvesting activities, neither of which we control.

The carrying amount of the investment in the venture is $187 million at March 31, 2011 and $201 million at December 31, 2010, and it is reported in the Consolidated Balance Sheets as Equity Investment in Timberland Venture. Our maximum exposure to loss is $187 million, the carrying amount of the investment in the venture. Generally, losses are first allocated among the common interests based on positive capital accounts in which we hold a 9% common interest. No losses are allocated to our preferred interest ($705 million) until the common interests have absorbed losses of approximately $861 million.

Note 12. Summarized Income Statement Information of Affiliate

The earnings of the Timberland Venture are a significant component of consolidated earnings. See Note 11 of the Notes to Consolidated Financial Statements. Equity earnings for the Timberland Venture were $14 million for each of the three month periods ending March 31, 2011 and 2010. Equity earnings includes the amortization of the difference between the book value of the company’s investment and its proportionate share of the Timberland Venture’s net assets of $1 million for each of the three month periods ended March 31, 2011 and 2010. Furthermore, interest expense in connection with the loan from the Timberland Venture was $14 million for each of the three month periods ended March 31, 2011 and 2010. The table below presents summarized income statement information for the Timberland Venture for the three months ended March 31 (in millions):

	Three Months Ended March 31,
	2011			2010
Revenues	$	4		$	5
Cost of Goods Sold(A)		5			6
Selling, General and Administrative Expenses		—			—
Operating Income		(1	)		(1	)
Interest Income, net		14			14
Net Income before Allocation to Preferred and Common Interests	$	13		$	13

(A) Cost of Goods Sold includes Depreciation, Depletion and Amortization of $4 million and $5 million for the three month periods ended March 31, 2011 and 2010, respectively.

13

PLUM CREEK TIMBER COMPANY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

Note 13. Segment Information

The tables below present information about reported segments for the quarterly periods ended March 31 (in millions):

	Northern Resources		Southern Resources		Real Estate		Manufactured Products		Other (A)		Total (B)
Quarter Ended March 31, 2011
External Revenues	$	52	$	89	$	62	$	67	$	5	$	275
Intersegment Revenues		3		—		—		—		—		3
Depreciation, Depletion and Amortization		6		12		—		3		—		21
Basis of Real Estate Sold		—		—		19		—		—		19
Other Operating Gain		—		—		—		—		2		2
Operating Income		7		19		38		4		7		75
Quarter Ended March 31, 2010
External Revenues	$	53	$	98	$	99	$	60	$	7	$	317
Intersegment Revenues		6		—		—		—		—		6
Depreciation, Depletion and Amortization		7		13		—		3		—		23
Basis of Real Estate Sold		—		—		32		—		—		32
Other Operating Gain		—		—		—		—		5		5
Operating Income		4		30		62		4		11		111

(A) During the first quarter of 2011, the company received a payment of $2 million for the settlement of a dispute that related to certain mineral rights. The $2 million payment is reported as Other Operating Gain in our Other Segment and is included in Other Operating Income (Expense), net in the Consolidated Statements of Income.

During the first quarter of 2010, the company agreed to terminate a land lease for consideration of $5 million from the lessor. The land lease had been accounted for as an operating lease. For the quarter ended March 31, 2010, the $5 million consideration is reported as Other Operating Gain in our Other Segment since the consideration was primarily for the release of mineral rights. For the quarter ended March 31, 2010, the $5 million is included in Other Operating Income (Expense), net in the Consolidated Statements of Income.

During the first quarter of 2010, we received $21 million for the sale of an undivided 50% interest in natural gas rights on approximately 110,000 acres in West Virginia and to modify an existing natural gas lease on the same acres. We allocated the proceeds based on relative fair value and determined that $11 million was for the sale of the natural gas rights and $10 million was for a lease bonus related to the modification of exploration rights under the existing lease. The fair value of the undivided 50% interest in natural gas rights was derived using an income approach based on discounted future cash flows. The discounted cash flows were based on estimated future gas production, gas prices and operating and capital expenditures using internal and external sources. For the quarter ended March 31, 2010, the sale is

14

PLUM CREEK TIMBER COMPANY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

reported as Gain on Sale of Properties, net of tax in the Consolidated Statements of Income and was not included in the Other Segment’s operating income. The fair value of the modification to the exploration rights under the existing lease was based on market analyses and comparable leases. The $10 million, along with the remaining deferred revenue at the time of the modification of $12 million associated with the original granting of exploration rights in 2008, is being amortized into revenue of the Other Segment over the expected three-year term.

(B) Consolidated depreciation, depletion and amortization includes unallocated corporate depreciation of $1 million each for the quarters ended March 31, 2011 and 2010.

A reconciliation of total segment operating income to income before income taxes is presented below for the quarterly periods ended March 31 (in millions):

	Quarter Ended March 31,
	2011			2010
Total Segment Operating Income	$	75		$	111
Corporate and Other Unallocated Expenses		(16	)		(16	)
Other Unallocated Operating Income (Expense), net		1			—
Operating Income		60			95
Equity Earnings from Timberland Venture		14			14
Total Interest Expense, net		(35	)		(34	)
Income before Income Taxes	$	39		$	75

Note 14. Subsequent Events

Quarterly Dividend. On May 3, 2011, the Board of Directors authorized the company to make a dividend payment of $0.42 per share, or approximately $68 million, which will be paid on May 31, 2011 to stockholders of record on May 16, 2011.

15

ITEM 1. FINANCIAL STATEMENTS (CONTINUED)

Included in this item are the consolidated financial statements related to Plum Creek Timberlands, L.P., a Delaware Limited Partnership and a wholly-owned subsidiary of Plum Creek Timber Company, Inc. These financial statements are provided pursuant to Rule 3-10 of Regulation S-X in connection with the shelf registration statement on Form S-3 filed in April of 2009 pursuant to which Plum Creek Timberlands, L.P. has registered and from time to time may offer and sell debt securities. As of March 31, 2011, Plum Creek Timberlands, L.P. has publicly issued and outstanding $1,033 million aggregate principal amount of Senior Notes (“Public Debt”) pursuant to the shelf registration statement.

PLUM CREEK TIMBERLANDS, L.P.

CONSOLIDATED STATEMENTS OF INCOME

(UNAUDITED)

	Quarter Ended March 31,
(In Millions)	2011			2010
REVENUES:
Timber	$	141		$	151
Real Estate		62			99
Manufacturing		67			60
Other		5			7
Total Revenues		275			317
COSTS AND EXPENSES:
Cost of Goods Sold:
Timber		107			109
Real Estate		22			35
Manufacturing		61			54
Other		—			—
Total Cost of Goods Sold		190			198
Selling, General and Administrative		28			29
Total Costs and Expenses		218			227
Other Operating Income (Expense), net		3			5
Operating Income		60			95
Equity Earnings from Timberland Venture		14			14
Interest Expense, net		21			20
Income before Income Taxes		53			89
Provision (Benefit) for Income Taxes		1			(1	)
Income from Continuing Operations		52			90
Gain on Sale of Properties, net of tax		—			11
Net Income before Allocation to Series T-1 Preferred Interest and Partners		52			101
Net Income Allocable to Series T-1 Preferred Interest		(14	)		(14	)
Net Income Available to Common Interest Partners	$	38		$	87

See accompanying Notes to Consolidated Financial Statements

16

PLUM CREEK TIMBERLANDS, L.P.

CONSOLIDATED BALANCE SHEETS

(UNAUDITED)

(In Millions)	March 31,   2011		December 31, 2010
ASSETS
Current Assets:
Cash and Cash Equivalents	$	254	$	252
Accounts Receivable		32		21
Taxes Receivable		4		2
Inventories		52		49
Deferred Tax Asset		8		7
Assets Held for Sale		38		57
Other Current Assets		15		22
		403		410
Timber and Timberlands, net		3,398		3,405
Property, Plant and Equipment, net		144		146
Equity Investment in Timberland Venture		187		201
Deferred Tax Asset		6		10
Investment in Grantor Trusts ($37 and $35 at Fair Value in 2011 and 2010)		38		36
Other Assets		42		44
Total Assets	$	4,218	$	4,252
LIABILITIES
Current Liabilities:
Current Portion of Long-Term Debt	$	45	$	94
Line of Credit		215		166
Accounts Payable		30		25
Interest Payable		19		16
Wages Payable		8		23
Taxes Payable		10		12
Deferred Revenue		20		25
Other Current Liabilities		9		7
		356		368
Long-Term Debt		1,643		1,643
Other Liabilities		76		77
Total Liabilities		2,075		2,088
Commitments and Contingencies
PARTNERSHIP CAPITAL
Series T-1 Preferred Interest		790		790
Partners’ Capital (Common Partnership Interests)		1,353		1,374
Total Partnership Capital		2,143		2,164
Total Liabilities and Partnership Capital	$	4,218	$	4,252

See accompanying Notes to Consolidated Financial Statements

17

PLUM CREEK TIMBERLANDS, L.P.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(UNAUDITED)

	Three Months Ended March 31,
(In Millions)	2011			2010
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income before Allocation to Preferred Partnership Interest and Partners	$	52		$	101
Adjustments to Reconcile Net Income to Net Cash Provided By Operating Activities:
Depreciation, Depletion and Amortization		22			24
Basis of Real Estate Sold		19			32
Equity Earnings from Timberland Venture		(14	)		(14	)
Distributions from Timberland Venture		28			28
Deferred Income Taxes		3			1
Gain on Sale of Properties and Other Assets		—			(11	)
Deferred Revenue from Long-Term Gas Leases (Net of Amortization)		7			8
Working Capital Changes		(30	)		(32	)
Other		3			6
Net Cash Provided By Operating Activities		90			143
CASH FLOWS FROM INVESTING ACTIVITIES
Capital Expenditures (Excluding Timberland Acquisitions)		(12	)		(13	)
Proceeds from Sale of Properties and Other Assets		—			11
Net Cash Used In Investing Activities		(12	)		(2	)
CASH FLOWS FROM FINANCING ACTIVITIES
Cash Distributions to Common Partners		(62	)		(69	)
Cash Distributions for Series T-1 Preferred Interest		(14	)		(14	)
Borrowings on Line of Credit		245			568
Repayments on Line of Credit		(196	)		(568	)
Principal Payments and Retirement of Long-Term Debt		(49	)		(53	)
Net Cash Used In Financing Activities		(76	)		(136	)
Increase (Decrease) In Cash and Cash Equivalents		2			5
Cash and Cash Equivalents:
Beginning of Period		252			299
End of Period	$	254		$	304

See accompanying Notes to Consolidated Financial Statements

18

PLUM CREEK TIMBERLANDS, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

Note 1. Basis of Presentation

General. Plum Creek Timberlands, L.P. is a Delaware Limited Partnership and a wholly-owned subsidiary of Plum Creek Timber Company, Inc. (“Parent”), a Delaware Corporation and a real estate investment trust, or “REIT”. References herein to “the Operating Partnership,” “we,” “us,” or “our” relate to Plum Creek Timberlands, L.P. and all of its wholly-owned consolidated subsidiaries; references to “Plum Creek” or “Parent” relate to Plum Creek Timber Company, Inc. and all of its wholly-owned consolidated subsidiaries.

At March 31, 2011, the Operating Partnership owned and managed approximately 6.7 million acres of timberlands in the Northwest, Southern, and Northeast United States, and owned eight wood product conversion facilities in the Northwest United States (two of which have been indefinitely curtailed). Included in the 6.7 million acres are approximately 1.05 million acres of higher value timberlands, which are expected to be sold and/or developed over the next fifteen years for recreational, conservation or residential purposes. In addition, the Operating Partnership has approximately 300,000 acres of non-strategic timberlands, which are expected to be sold in smaller acreage transactions over the near and medium term. In the meantime, all of our timberlands continue to be managed productively in our business of growing and selling timber.

The consolidated financial statements of the Operating Partnership include the accounts of Plum Creek Timberlands, L.P. and its subsidiaries. The Operating Partnership is 100% owned by Plum Creek. Plum Creek has no assets or liabilities other than its direct and indirect ownership interests in Plum Creek Timberlands, L.P. and its interest in Plum Creek Ventures I, LLC (“PC Ventures”), a 100% owned subsidiary of Plum Creek. The Parent has no operations other than its investment in these subsidiaries and transactions in its own equity, such as the issuance and/or repurchase of common stock and the receipt of proceeds from stock option exercises. Intercompany transactions and accounts between Plum Creek Timberlands, L.P. and its subsidiaries have been eliminated in consolidation. All transactions are denominated in United States dollars.

Plum Creek Timber Company, Inc. has elected to be taxed as a REIT under sections 856-860 of the United States Internal Revenue Code and, as such, generally does not pay corporate-level income tax. However, the Operating Partnership conducts certain non-REIT activities through various wholly-owned taxable REIT subsidiaries, which are subject to corporate-level income tax. These activities include our manufacturing operations, the harvesting and sale of logs, and the development and/or sale of some of our higher value timberlands. The Operating Partnership’s tax provision includes the tax expense and/or benefit associated with Plum Creek’s taxable REIT subsidiaries, as well as any tax expense and/or benefit incurred by the REIT. The effective tax rate for the Operating Partnership is lower than the federal corporate statutory rate primarily due to Plum Creek’s status as a REIT.

The consolidated financial statements included in this Form 10-Q are unaudited and do not contain all of the information required by U.S. generally accepted accounting principles to be included in a full set of financial statements. These interim consolidated financial statements in this Form 10-Q should be read in conjunction with the audited consolidated financial statements of Plum Creek Timberlands, L.P. for the three years ended December 31, 2010, which were included on Form 10-K of Plum Creek Timber Company, Inc. and filed with the SEC on February 25, 2011, and which include a summary of significant accounting policies of the Operating Partnership. In the opinion of management, all material adjustments necessary to present fairly the results of operations for such periods have been included in this Form 10-Q. All such adjustments are of a normal and recurring nature. The results of operations for interim periods are not necessarily indicative of the results of operations for the entire year.

19

PLUM CREEK TIMBERLANDS, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

Note 2. Inventory

Inventories, accounted for using the lower of average cost or market, consisted of the following (in millions):

	March 31, 2011			December 31, 2010
Raw Materials (primarily logs)	$	11		$	12
Work-In-Process		2			1
Finished Goods		28			24
		41			37
Supplies		11			12
Total	$	52		$	49
Note 3. Timber and Timberlands Timber and Timberlands consisted of the following (in millions):
	March 31, 2011			December 31, 2010
Timber and Logging Roads, net	$	2,257		$	2,261
Timberlands		1,141			1,144
Timber and Timberlands, net	$	3,398		$	3,405
Note 4. Property, Plant and Equipment Property, Plant and Equipment consisted of the following (in millions):
	March 31, 2011			December 31, 2010
Land, Buildings and Improvements	$	84		$	84
Machinery and Equipment		312			309
		396			393
Accumulated Depreciation		(252	)		(247	)
Property, Plant and Equipment, net	$	144		$	146

20

PLUM CREEK TIMBERLANDS, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

Note 5. Borrowings

Debt consisted of the following (in millions):

	March 31, 2011			December 31, 2010
Variable Rate Debt
Term Credit Agreement (A)	$	350		$	350
Revolving Line of Credit (B)		215			166
Fixed Rate Debt
Senior Notes		1,338			1,387
Total Debt		1,903			1,903
Less: Current Portion of Long-Term Debt		(45	)		(94	)
Less: Line of Credit		(215	)		(166	)
Long-Term Portion	$	1,643		$	1,643

(A) As of March 31, 2011, the interest rate on the $350 million term credit agreement was 0.74%.

(B) As of March 31, 2011, the weighted-average interest rate for the borrowings on the line of credit was 1.92%. As of March 31, 2011, we had $215 million of borrowings and $3 million of standby letters of credit outstanding; $382 million remained available for borrowing under our $600 million line of credit. As of April 1, 2011, all of the borrowings outstanding under our line of credit were repaid.

21

PLUM CREEK TIMBERLANDS, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

Note 6. Partners’ Capital

The changes in the Operating Partnership’s capital accounts were as follows during the first three months of 2011 (in millions):

	Preferred Partnership Interest			Common Partners’ Capital			Accumulated Other Comprehensive Income (Loss)			Total Partnership Capital
January 1, 2011	$	790		$	1,385		$	(11	)	$	2,164
Net Income before Allocation to Series T-1 Preferred Interest and Partners					52						52
Other Comprehensive Income (Loss), net of tax								1			1
Total Comprehensive Income											53
Net Income Allocation to Series T-1 Preferred Interest		14			(14	)					—
Distributions to Partners (Common Partnership Interests)					(62	)					(62	)
Distributions for Series T-1 Preferred Interest		(14	)								(14	)
Capital Contributions from Parent					2						2
March 31, 2011	$	790		$	1,363		$	(10	)	$	2,143

22

PLUM CREEK TIMBERLANDS, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

Note 7. Fair Value Measurements

Assets and Liabilities Measured at Fair Value on a Recurring Basis. The Operating Partnership’s fair value measurements of its financial instruments, measured on a recurring basis, are categorized as Level 1 measurements under the fair value hierarchy in the Accounting Standards Codification. A Level 1 valuation is based on quoted prices in active markets at the measurement date for identical unrestricted assets or liabilities. Summarized below are the Level 1 assets reported in the Operating Partnership’s financial statements at fair value, measured on a recurring basis (in millions):

	Balance at March 31, 2011		Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets of Identical Assets (Level 1 Measurements)
Cash Equivalents (A)	$	250		$           250
Available-for-Sale Securities (B)		32		32
Trading Securities (B)		5		5
Total	$	287		$           287
	Balance at December 31, 2010		Fair Value  Measurements at Reporting Date Using Quoted Prices in Active   Markets of Identical Assets (Level 1 Measurements)
Cash Equivalents (A)	$	249	$	249
Available-for-Sale Securities (B)		30		30
Trading Securities (B)		5		5
Total	$	284	$	284

(A) Consists of several money market funds and is included in the $254 million and $252 million of Cash and Cash Equivalents in the Consolidated Balance Sheets at March 31, 2011 and December 31, 2010, respectively.

(B) Consists of several mutual funds and is included in Investment in Grantor Trusts in the Consolidated Balance Sheets at March 31, 2011 and December 31, 2010. At March 31, 2011, investments in these mutual funds were approximately 50% in domestic (U.S.) equities, 20% in international equities and 30% in debt securities.

Available-for-Sale Securities. Certain investments in the grantor trusts relate to the Operating Partnership’s non-qualified pension plans and are classified as available-for-sale securities. The Operating Partnership has invested in various money market, debt and equity mutual funds and plans to use these investments to fund its non-qualified pension obligations. Unrealized holding gains and losses are included as a component of accumulated other comprehensive income. The Operating Partnership records changes in unrealized holding gains and losses in Other Comprehensive Income, unless an other than temporary impairment has occurred, which is then charged to expense. Changes in the fair value of available-for-sale securities were not material to the Operating Partnership’s financial position or results of operations.

Trading Securities. Certain investments in the grantor trusts relate to the Operating Partnership’s deferred compensation plans and are classified as trading securities. Deferred compensation amounts are invested in various money market, debt and equity mutual funds. The Operating Partnership plans to use these investments to fund deferred compensation obligations. Realized gains and losses and changes in unrealized gains and losses (and a corresponding amount of compensation expense) are recognized in the Operating Partnership’s Consolidated Statements of Income. Deferred compensation obligations are included in Other Liabilities and were $5 million at March 31, 2011 and $5 million at December 31, 2010. Changes in the fair value of trading securities were not material to the Operating Partnership’s financial position or results of operations.

23

PLUM CREEK TIMBERLANDS, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

Other Instruments. The carrying amount of notes receivable approximates fair value due to the short-term maturities of these instruments. The estimated fair value of the Operating Partnership’s debt was approximately $1.95 billion at both March 31, 2011 and December 31, 2010, and the carrying amount was $1.90 billion at both March 31, 2011 and December 31, 2010. The fair value of the Operating Partnership’s Public Debt (publicly issued Senior Notes) is estimated using market quotes. The fair value of the Operating Partnership’s Private Debt (Senior Notes with various maturities and fixed interest rates which are privately placed with various lenders) is estimated using the same rates adjusted for the different maturities. The fair value of our Term Credit Agreement was determined by adjusting the spread over LIBOR to a current market spread for comparable debt.

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis. There were no fair value measurements of assets or liabilities measured on a nonrecurring basis during the three-month periods ended March 31, 2011 and 2010.

Note 8. Employee Pension Plans

The components of pension cost were as follows for the quarterly periods ended March 31 (in millions):

	Quarter Ended March 31,
	2011			2010
Service Cost	$	2		$	2
Interest Cost		2			2
Expected Return on Plan Assets		(2	)		(2	)
Total Pension Cost	$	2		$	2

Note 9. Commitments and Contingencies

Contingencies. The Operating Partnership is subject to regulations regarding forest, harvest and manufacturing practices and is, from time to time, involved in various legal proceedings, including environmental and regulatory matters, incidental to its business. Reserves have been established for any probable losses.

Unrecorded Contingencies. Management currently believes that resolving pending legal proceedings against the Operating Partnership, individually or in aggregate, will not have a material adverse impact on our financial position or results of operations. However, these matters are subject to inherent uncertainties and management’s view on these matters may change in the future. Were an unfavorable final outcome in one or multiple legal proceedings to occur, there exists the possibility of a material adverse impact on our financial position and the results of operations for the period in which any unfavorable outcome becomes reasonably estimable.

Note 10. Variable Interest Entities

On October 1, 2008, a subsidiary of the Operating Partnership, Plum Creek Timber Operations I, LLC (“PC Member”), contributed 454,000 acres of timberlands located in its Southern Resources Segment to Southern Diversified Timber, LLC (“the Timberland Venture”) in exchange for a $705 million preferred interest and a 9% common interest valued at $78 million. The Timberland Venture’s other member, an affiliate of The Campbell Group LLC, contributed $783 million of cash in exchange for

24

PLUM CREEK TIMBERLANDS, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

91% of the Timberland Venture’s common interest. Following the formation of the Timberland Venture, PC Ventures borrowed $783 million from the Timberland Venture. PC Ventures used the proceeds from the borrowing to make a $783 million capital contribution to the Operating Partnership. The Operating Partnership accounts for its interest in the Timberland Venture under the equity method of accounting.

The Timberland Venture is a variable interest entity. The primary operating activities of the Timberland Venture consist of owning timberlands and entering into harvesting contracts with an affiliate of the other member. Besides quarterly distributions to PC Ventures which it uses to fund interest payments on the loan owed by PC Ventures, the Operating Partnership has not provided financing or other support to the venture. The venture is financed by a $15 million line of credit obtained by the Timberland Venture.

We are not the primary beneficiary of the Timberland Venture. PC Member does not manage the day-to-day operations of the Timberland Venture, it has only limited protective rights and its involvement is generally limited to receiving distributions on its preferred and common interests. We are not the primary beneficiary because we do not direct the activities that most significantly impact the Timberland Venture’s economic performance. We believe that the activities that most significantly impact the Timberland Venture’s economic performance include managing the timberlands along with the timing and extent of the harvesting activities, neither of which we control.

The carrying amount of the investment in the venture is $187 million at March 31, 2011 and $201 million at December 31, 2010, and it is reported in the Consolidated Balance Sheets as Equity Investment in Timberland Venture. Our maximum exposure to loss is $187 million, the carrying amount of the investment in the venture. Generally, losses are first allocated among the common interests based on positive capital accounts in which we hold a 9% common interest. No losses are allocated to our preferred interest ($705 million) until the common interests have absorbed losses of approximately $861 million.

Note 11. Summarized Income Statement Information of Affiliate

The earnings of the Timberland Venture are a significant component of consolidated earnings. See Note 10 of the Notes to Consolidated Financial Statements. Equity earnings for the Timberland Venture were $14 million for each of the three month periods ending March 31, 2011 and 2010. Equity earnings includes the amortization of the difference between the book value of the Operating Partnership’s investment and its proportionate share of the Timberland Venture’s net assets of $1 million for each of the three month periods ended March 31, 2011 and 2010. The table below presents summarized income statement information for the Timberland Venture for the three months ended March 31 (in millions):

	Three Months Ended March 31,
	2011			2010
Revenues	$	4		$	5
Cost of Goods Sold(A)		5			6
Selling, General and Administrative Expenses		—			—
Operating Income		(1	)		(1	)
Interest Income, net		14			14
Net Income before Allocation to Preferred and Common Interests	$	13		$	13

(A) Cost of Goods Sold includes Depreciation, Depletion and Amortization of $4 million and $5 million for the three month periods ended March 31, 2011 and 2010, respectively.

25

PLUM CREEK TIMBERLANDS, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

Note 12. Segment Information

The tables below present information about reported segments for the quarterly periods ended March 31 (in millions):

	Northern Resources		Southern Resources		Real Estate		Manufactured Products		Other (A)		Total  (B)
Quarter Ended March 31, 2011
External Revenues	$	52	$	89	$	62	$	67	$	5	$	275
Intersegment Revenues		3		—		—		—		—		3
Depreciation, Depletion and Amortization		6		12		—		3		—		21
Basis of Real Estate Sold		—		—		19		—		—		19
Other Operating Gain		—		—		—		—		2		2
Operating Income		7		19		38		4		7		75
Quarter Ended March 31, 2010
External Revenues	$	53	$	98	$	99	$	60	$	7	$	317
Intersegment Revenues		6		—		—		—		—		6
Depreciation, Depletion and Amortization		7		13		—		3		—		23
Basis of Real Estate Sold		—		—		32		—		—		32
Other Operating Gain		—		—		—		—		5		5
Operating Income		4		30		62		4		11		111

(A) During the first quarter of 2011, the Operating Partnership received a payment of $2 million for the settlement of a dispute related to certain mineral rights. The $2 million payment is reported as Other Operating Gain in our Other Segment and is included in Other Operating Income (Expense), net in the Consolidated Statements of Income.

During the first quarter of 2010, the Operating Partnership agreed to terminate a land lease for consideration of $5 million from the lessor. The land lease had been accounted for as an operating lease. For the quarter ended March 31, 2010, the $5 million consideration is reported as Other Operating Gain in our Other Segment since the consideration was primarily for the release of mineral rights. For the quarter ended March 31, 2010, the $5 million is included in Other Operating Income (Expense), net in the Consolidated Statements of Income.

During the first quarter of 2010, we received $21 million for the sale of an undivided 50% interest in natural gas rights on approximately 110,000 acres in West Virginia and to modify an existing natural gas lease on the same acres. We allocated the proceeds based on relative fair value and determined that $11 million was for the sale of the natural gas rights and $10 million was for a lease bonus related to the modification of exploration rights under the existing lease. The fair value of the undivided 50% interest in natural gas rights was derived using an income approach based on discounted future cash flows. The discounted cash flows were based on estimated future gas production, gas prices and operating and capital expenditures using internal and external sources. For the quarter ended March 31, 2010, the sale is reported as Gain on Sale of Properties, net of tax in the Consolidated Statements of Income and was not included in the Other Segment’s operating income. The fair value of the modification to the exploration rights under the existing lease was based on market analyses and comparable leases. The $10 million, along with the remaining deferred revenue at the time of the modification of $12 million associated with the original granting of exploration rights in 2008, is being amortized into revenue of the Other Segment over the expected three-year term.

26

PLUM CREEK TIMBERLANDS, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

(B) Consolidated depreciation, depletion and amortization includes unallocated corporate depreciation of $1 million each for the quarters ended March 31, 2011 and 2010.

A reconciliation of total segment operating income to income before income taxes is presented below for the quarterly periods ended March 31 (in millions):

	Quarter Ended March 31,
	2011			2010
Total Segment Operating Income	$	75		$	111
Corporate and Other Unallocated Expenses		(16	)		(16	)
Other Unallocated Operating Income (Expense), net		1			—
Operating Income		60			95
Equity Earnings from Timberland Venture		14			14
Interest Expense, net		(21	)		(20	)
Income before Income Taxes	$	53		$	89

27

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Forward-Looking Statement

This Report contains forward-looking statements within the meaning of the Private Litigation Reform Act of 1995. Some of the forward-looking statements can be identified by the use of forward-looking words such as “believes,” “expects,” “may,” “will,” “should,” “seeks,” “approximately,” “intends,” “plans,” “estimates,” “projects,” “strategy,” or “anticipates,” or the negative of those words or other comparable terminology. Forward-looking statements involve inherent risks and uncertainties. A number of important factors could cause actual results to differ materially from those described in the forward-looking statements, including those factors described under the heading “Risk Factors” in our filings with the Securities and Exchange Commission under the Securities Exchange Act of 1934, as amended, and Securities Act of 1933, as amended, including, but not limited to, our Annual Report on Form 10-K for the year ended December 31, 2010. Some factors include changes in governmental, legislative and environmental restrictions, catastrophic losses from fires, floods, windstorms, earthquakes, volcanic eruptions, insect infestations or diseases, as well as changes in economic conditions and competition in our domestic and export markets and other factors described from time to time in our filings with the Securities and Exchange Commission. In addition, factors that could cause our actual results to differ from those contemplated by our projected, forecasted, estimated or budgeted results as reflected in forward-looking statements relating to our operations and business include, but are not limited to:

• the failure to meet our expectations with respect to our likely future performance;

• an unanticipated reduction in the demand for timber products and/or an unanticipated increase in supply of timber products;

• an unanticipated reduction in demand for higher value timberlands or non-strategic timberlands;

• our failure to make strategic acquisitions or to integrate any such acquisitions effectively or, conversely, our failure to make strategic divestitures; and

• our failure to qualify as a real estate investment trust, or REIT.

It is likely that if one or more of the risks materializes, or if one or more assumptions prove to be incorrect, the current expectations of Plum Creek and its management will not be realized. Forward-looking statements speak only as of the date made, and neither Plum Creek nor its management undertakes any obligation to update or revise any forward-looking statements.

The following discussion and analysis should be read in conjunction with the financial information and analysis included in our 2010 Annual Report on Form 10-K filed with the Securities and Exchange Commission on February 25, 2011.

Organization of the Company

In management’s discussion and analysis of financial condition and results of operations (Item 2 of this form), when we refer to “Plum Creek,” “the company,” “we,” “us,” or “our,” we mean Plum Creek Timber Company, Inc. and its consolidated subsidiaries. References to Notes to Consolidated Financial Statements refer to the Notes to the Consolidated Financial Statements of Plum Creek Timber Company, Inc. included in Item 1 of this Form 10-Q.

Plum Creek Timber Company, Inc., a Delaware Corporation and a real estate investment trust, or “REIT”, for federal income tax purposes, is the parent company of Plum Creek Timberlands, L.P., a Delaware Limited Partnership (the “Operating Partnership” or “Partnership”), and Plum Creek Ventures I, LLC, a Delaware Limited Liability Company (“PC Ventures”). Plum Creek conducts substantially all of its activities through the Operating Partnership and various wholly-owned subsidiaries of the Operating Partnership.

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The Operating Partnership has borrowed and has currently outstanding $1.9 billion principal amount of debt, including $1.0 billion of publicly issued notes. PC Ventures has borrowed and has currently outstanding $783 million in principal amount of debt (“the Note Payable to Timberland Venture”) from an entity (“the Timberland Venture”) in which a subsidiary of the Operating Partnership has a common and preferred equity interest. See Note 11 of the Notes to Consolidated Financial Statements. PC Ventures used the proceeds from the borrowing to make a $783 million capital contribution to the Operating Partnership in exchange for a preferred equity interest in the Operating Partnership. PC Ventures has no other activities and the Operating Partnership has no ownership interest in PC Ventures.

The Note Payable to Timberland Venture is an obligation of PC Ventures and not an obligation of the Operating Partnership. Therefore, any discussion of the Note Payable to Timberland Venture below is not applicable to the Operating Partnership. Unless otherwise specified, all other discussion and analysis below are applicable to both Plum Creek and the Operating Partnership.

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Results of Operations

First Quarter 2011 Compared to First Quarter 2010

The following tables and narrative compare operating results by segment for the quarters ended March 31 (in millions):

	Quarter Ended March 31,
	2011		2010		Change
Operating Income by Segment
Northern Resources	$	7	$	4	$	3
Southern Resources		19		30		(11	)
Real Estate		38		62		(24	)
Manufactured Products		4		4		—
Other		7		11		(4	)
Total Segment Operating Income		75		111		(36	)
Other Costs and Eliminations, net		(15)		(16)		1
Operating Income	$	60	$	95	$	(35	)

Northern Resources Segment. Key operating statistics for the segment are as follows:

	Quarter Ended March 31, 2011				Quarter Ended March 31, 2010
	Harvest Tons (millions)		Average  Sales Realization		Harvest Tons (millions)		Average Sales Realization
Sawlog ($/Ton Delivered)		0.506	$	69		0.627	$	59
Pulpwood ($/Ton Delivered)		0.478	$	40		0.527	$	38
Total		0.984				1.154

Revenues decreased by $4 million, or 7%, to $55 million in the first quarter of 2011 compared to the first quarter of 2010. This decrease was due primarily to lower sawlog harvest volumes ($6 million) and lower pulpwood volumes ($2 million), partially offset by higher sawlog prices ($4 million). Sawlog harvest volumes were 19% lower compared to the first quarter of 2010. During the first quarter of 2010, we temporarily increased harvest levels in order to increase the supply of logs at our mills in response to improving lumber and plywood prices and to fulfill commitments under log supply agreements that were deferred in 2009 due to weak product prices. Additionally, harvest levels were constrained during the first quarter of 2011 as a result of heavy snowfall.

Sawlog prices were 17% higher in the first quarter of 2011 compared to the first quarter of 2010 due primarily to the increase in demand from China for the export of sawlogs from the Pacific Northwest. Log shipments from the U.S. to China during 2010 increased nearly three times over the prior year, and this trend has continued in 2011.

Northern Resources Segment operating income was 13% of its revenues for the first quarter of 2011 and 7% for the first quarter of 2010. This increase was due primarily to higher sawlog prices. Segment costs and expenses decreased by $7 million, or 13%, to $48 million due primarily to lower harvest levels.

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Southern Resources Segment. Key operating statistics for the segment are as follows:

	Quarter Ended March 31, 2011				Quarter Ended March 31, 2010
	Harvest Tons (millions)		Average Sales Realization		Harvest Tons (millions)		Average Sales Realization
Sawlog ($/Ton Stumpage)		1.286	$	20		1.274	$	23
Pulpwood ($/Ton Stumpage)		1.494	$	10		1.526	$	13
Total		2.780				2.800

Revenues decreased by $9 million, or 9%, to $89 million in the first quarter of 2011 compared to the first quarter of 2010. This decrease was due primarily to lower pulpwood prices ($5 million), lower sawlog prices ($2 million), and lower pulpwood volumes ($1 million). Pulpwood prices were 27% lower on a stumpage basis (12% lower on a delivered basis) in the first quarter of 2011 due primarily to weather-related log shortages in the first quarter of 2010 and the temporary supply-chain disruption of pulp as a result of the February 2010 earthquake in Chile. In contrast, there was an ample supply of logs during the first quarter of 2011 due to unseasonably dry weather conditions.

Sawlog prices were 13% lower on a stumpage basis (5% lower on a delivered basis) in the first quarter of 2011 compared to the first quarter of 2010. This decrease was due primarily to an ample supply of logs as a result of favorable harvesting conditions, weak demand and, to a lesser extent, selling a greater proportion of smaller diameter sawlogs. The demand for sawlogs remains weak due to declining lumber and plywood prices and near record low housing starts. Housing starts in the U.S. were 10% lower during the first quarter of 2011 compared to the first quarter of 2010.

Southern Resources Segment operating income was 21% of its revenues for the first quarter of 2011 and 31% for the first quarter of 2010. This decrease was due primarily to lower pulpwood and sawlog prices and higher log and haul costs. Segment costs and expenses increased by $2 million, or 3%, to $70 million due primarily to an increase in the cost of fuel. Log and haul costs on a per ton basis increased 7% ($3 million) in the first quarter of 2011 compared to the first quarter of 2010.

Real Estate Segment.

	Quarter Ended March 31, 2011						Quarter Ended March 31, 2010
Property	Acres Sold		Revenues (millions)		Revenue per Acre		Acres Sold		Revenues (millions)		Revenue per Acre
Small Non-Strategic		2,560	$	3	$	1,015		29,640	$	26	$	885
Large Non-Strategic		30,295		43		1,405		24,310		32		1,320
Conservation		335		1		1,685		35,120		19		545
Higher and Better Use / Recreational		7,795		16		2,100		9,080		19		2,125
Development Properties		—		—		—		730		2		3,050
Total		40,985	$	62				98,880	$	99

Revenues decreased by $37 million to $62 million in the first quarter of 2011. This decrease is due primarily to lower revenues from sales of small non-strategic properties ($23 million) and conservation properties ($18 million), offset in part by an increase in large non-strategic land sales ($11 million). Additionally, our higher and better use / recreational and development sales were both lower as demand remained weak.

During the first quarter of 2010 we sold approximately 83,000 acres in several large sales that included approximately 23,000 acres of small non-strategic properties for $21 million, approximately 35,000 acres of conservation properties for $19 million, and approximately 24,000 acres of large non-strategic properties for $32 million. Whereas, during the first quarter of 2011 we had only one large sale of approximately 30,000 acres of large non-strategic properties for $43 million.

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Conservation sales vary significantly from period to period and are primarily impacted by government and not-for-profit funding, the limited number of conservation buyers, and the timing of our transactions. Additionally, the price per acre for conservation properties can vary significantly due to the geographic location and the rationale for the conservation designation.

The timing of real estate sales is a function of many factors, including the general state of the economy, demand in local real estate markets, the ability to obtain entitlements, the ability of buyers to obtain financing, the number of competing properties listed for sale, the seasonal nature of sales (particularly in the northern states), the plans of adjacent landowners, our expectation of future price appreciation, the timing of harvesting activities, and the availability of government and not-for-profit funding (especially for conservation sales).

We expect revenues from real estate sales during 2011 to range between $250 million and $300 million, which includes timberlands that are less strategic to the company (large non-strategic sales).

Real Estate Segment operating income as a percent of revenue was 61% for the first quarter of 2011 and 63% for the first quarter of 2010. Real Estate Segment costs and expenses decreased by $13 million to $24 million in the first quarter of 2011 due primarily to selling fewer acres during 2011.

Manufactured Products Segment. Key operating statistics for the segment are as follows:

	Quarter Ended March 31, 2011				Quarter Ended March 31, 2010
	Sales Volume		Average Sales Realization  (A)		Sales Volume		Average Sales Realization  (A)
Lumber		29,250 MBF	$	533		28,791 MBF	$	501
Plywood		44,156 MSF	$	371		45,104 MSF	$	352
Fiberboard		40,690 MSF	$	608		35,347 MSF	$	588

(A) Represents product prices at mill level.

Revenues increased by $7 million, or 12%, to $67 million in the first quarter of 2011 compared to the first quarter of 2010. This increase was due primarily to higher MDF sales volume ($4 million), higher MDF prices ($1 million) and higher lumber prices ($1 million).

MDF sales volume increased 15% in the first quarter of 2011 compared to the first quarter of 2010. This increased sales volume was due primarily to increased demand from our industrial customers (e.g., store fixtures and architectural doors) as a result of the improving U.S. economy.

Manufactured Products Segment operating income was 6% of its revenues for the first quarter of 2011 and was 7% for the first quarter of 2010. Manufactured Products Segment costs and expenses increased by $7 million, or 13%, to $63 million for the first quarter of 2011 due primarily to increased MDF production volumes and higher MDF resin costs. We continue to operate our manufacturing facilities at a reduced capacity.

Other Segment. Operating income decreased $4 million to $7 million in the first quarter of 2011 due primarily to a $5 million operating gain in connection with the termination of a land lease (primarily for the release of mineral rights) in the first quarter of 2010. Partially offsetting the decrease in operating income was a payment of $2 million that we received during the first quarter of 2011 for the settlement of a dispute that related to certain mineral rights. The $2 million and $5 million gains are recorded in our Other Segment and reported as Other Operating Income (Expense), net in our Consolidated Statements of Income.

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During the first quarter of 2010, we received cash proceeds of $21 million for the sale of an undivided 50% interest in mineral rights (natural gas reserves on properties located in West Virginia) and to amend an agreement covering existing exploration rights. We allocated $11 million to the sale of mineral rights and $10 million to the modification of exploration rights. The sale of mineral rights is reported as Gain on Sale of Properties, net of tax in our Consolidated Statements of Income and was not included in the Other Segment’s operating income. The remaining consideration of $10 million related to the modified exploration rights, along with the remaining deferred revenue at the time of the modification of $12 million associated with the original granting of exploration rights in 2008, is being amortized into revenue of the Other Segment over the expected three-year term.

Other Costs and Eliminations, net. Other costs and eliminations (which consists of corporate overhead and intercompany profit elimination) decreased operating income by $15 million in the first quarter of 2011 and by $16 million in the first quarter of 2010.

Interest Expense, net. Interest expense, net of interest income, increased $1 million, or 3%, to $35 million in the first quarter of 2011.

Provision (Benefit) for Income Taxes. The provision for income taxes was $1 million for the first quarter of 2011 compared to a benefit for income taxes of $1 million for the first quarter of 2010. In the first quarter of 2011, we recorded a valuation allowance of $2 million to reflect the estimated amount of deferred tax assets that may not be realized. The valuation allowance is primarily related to certain state net operating loss carryforwards that we do not believe it is more likely than not they will be realized in future periods.

Our determination of the realization of deferred tax assets is based upon management’s judgment of various future events and uncertainties, including the timing, nature and amount of future taxable income earned by certain wholly-owned subsidiaries. A valuation allowance is recognized if management believes it is more likely than not that some portion, or all, of the deferred tax asset will not be realized. At March 31, 2011, we have recorded deferred tax assets of $51 million (offset by a $2 million valuation allowance) and deferred tax liabilities of $37 million. Management believes that due to either the reversal of various taxable temporary differences or projected taxable income, sufficient taxable income can be generated to fully utilize the company’s deferred tax assets for which a valuation allowance was determined to be unnecessary.

Gain on Sale of Properties, net of tax. During 2010, we sold an undivided 50% interest in mineral rights (natural gas reserves) on properties located in West Virginia for $11 million. See Other Segment above for detailed discussion of the transaction.

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Financial Condition and Liquidity

We believe we have a strong balance sheet and do not foresee any near-term liquidity issues. At March 31, 2011, we had a cash balance of $254 million and had availability of $382 million under our line of credit. During the first quarter of 2011, we generated cash from operating activities of $76 million and we refinanced $49 million of maturing 7.83% senior notes with our line of credit. We have summarized our sources and uses of cash in a table near the end of this section.

The following table summarizes total cash flows for operating, investing and financing activities for the three months ended March 31 (in millions):

	Three Months Ended March 31,
	2011			2010			Change
Net Cash Provided By Operating Activities	$	76		$	129		$	(53	)
Net Cash Used In Investing Activities		(12	)		(2	)		(10	)
Net Cash Used In Financing Activities		(62	)		(122	)		60
Change in Cash and Cash Equivalents	$	2		$	5		$	(3	)

Cash Flows from Operating Activities. Net cash provided by operating activities for the three months ended March 31, 2011 totaled $76 million compared to $129 million for the same period in 2010. This decrease of $53 million is due primarily to lower proceeds from real estate sales of $37 million and lower operating income from our Southern Resources Segment of $11 million. See Results of Operations for a discussion of the factors impacting our Real Estate and Southern Resources Segments.

Capital Expenditures. Capital expenditures for the three months ended March 31, 2011 were $12 million compared to $13 million for the same period in 2010. Planned capital expenditures for 2011 (excluding timberland acquisitions) are expected to be approximately $75 million and include approximately $63 million for our timberlands, $4 million for our manufacturing facilities, $4 million for real estate development investments, and $4 million for investments in information technology. The timberland expenditures are primarily for reforestation and other expenditures associated with the planting and growing of trees. Approximately 55% of planned capital expenditures in 2011 are discretionary, primarily expenditures for silviculture. Capital expenditures at our manufacturing facilities consist primarily of expenditures to sustain operating activities.

Debt Financing. We strive to maintain a balance sheet that provides the financial flexibility to pursue our strategic objectives. In order to maintain this financial flexibility, our objective is to maintain an investment grade credit rating. This is reflected in our moderate use of debt, established access to credit markets and no material covenant restrictions in our debt agreements that would prevent us from prudently using debt capital. All of our borrowings, except for the Note Payable to Timberland Venture, are made by Plum Creek Timberlands, L.P., the company’s wholly-owned operating partnership (“the Partnership”). Furthermore, all of the outstanding indebtedness of the Partnership is unsecured.

Line of Credit. We have a $600 million revolving line of credit agreement that matures in January 2015. As of March 31, 2011, the weighted-average interest rate for the borrowings on the line of credit was 1.92%. The interest rate on the line of credit is based on LIBOR plus 1.70%. This rate can range from LIBOR plus 1.275% to LIBOR plus 2% depending on our debt ratings. In addition to interest expense on outstanding borrowings, we pay an annual facility fee equal to 0.3% of the entire line regardless of the amount drawn on the line during the year. Subject to customary covenants, the line of credit allows for borrowings from time to time up to $600 million, including up to $100 million of standby letters of credit. Borrowings on the line of credit fluctuate daily based on cash needs. As of March 31, 2011, we had $215 million of borrowings and $3 million of standby letters of credit outstanding; $382 million remained available for borrowing under our line of credit. As of April 1, 2011, all of the borrowings outstanding under our line of credit were repaid.

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Term Credit Agreement. The company has a $350 million term credit agreement that matures in June 2012. As of March 31, 2011, the interest rate for the term credit agreement was 0.74%. The interest rate is based on LIBOR plus 0.45%. This rate can range from LIBOR plus 0.3% to LIBOR plus 1.15% depending on our debt ratings. The term credit agreement is subject to covenants that are substantially the same as those of the revolving line of credit. The agreement allows for prepayment of the borrowings at any time prior to the maturity date without premium or penalty.

Senior Notes. The company has outstanding Senior Notes with various maturities and fixed interest rates. As of March 31, 2011, the company has $309 million aggregate principal amount of Senior Notes outstanding that are privately placed borrowings with various lenders (“Private Debt”). The Private Debt matures serially through 2016.

As of March 31, 2011, the company has publicly issued and outstanding $1.0 billion aggregate principal amount of Senior Notes (“Public Debt”). The Public Debt consists of $575 million aggregate principal amount of 4.70% Public Debt which matures in 2021 and 5.875% Public Debt with an aggregate principal amount of $458 million which matures in 2015. The Public Debt is issued by the Partnership and is fully and unconditionally guaranteed by Plum Creek Timber Company, Inc.

Senior Notes outstanding, including unamortized discount, consisted of the following (in millions):

	March 31, 2011		December 31, 2010
Senior Notes
Public Debt	$	1,029	$	1,029
Private Debt		309		358
Total Senior Notes	$	1,338	$	1,387

Plum Creek Timber Company, Inc. and the Partnership have filed a shelf registration statement with the Securities and Exchange Commission which expires on April 24, 2012. Under the shelf registration statement, Plum Creek Timber Company, Inc., from time to time, may offer and sell any combination of preferred stock, common stock, depositary shares, warrants and guarantees, and the Partnership, from time to time, may offer and sell debt securities. The company and the Partnership intend to maintain a shelf registration statement with respect to such securities.

Debt Covenants. Our Senior Notes, Term Credit Agreement and Line of Credit contain various restrictive covenants, none of which are expected to materially impact the financing of our ongoing operations. We are in compliance with all of our borrowing agreement covenants as of March 31, 2011.

Our Line of Credit and Term Credit Agreement require that we maintain certain interest coverage and maximum leverage ratios. We have no covenants and restrictions associated with changes in our debt ratings. Furthermore, there are no material covenants associated with our Note Payable to Timberland Venture, and this indebtedness is not considered in computing any of our debt covenants since the debt is an obligation of Plum Creek Timber Company, Inc. and not the Partnership.

The borrowing agreements for the Private Debt include limitations on the incurrence of indebtedness, making restricted payments (such as payments of cash dividends or stock repurchases), harvest levels and sales of assets. The restricted payments covenant is based on a computation of “available cash,” which is generally our net income (excluding gains on the sale of capital assets) after adjusting for non-cash charges (such as depreciation and depletion), changes in various reserves, less capital expenditures and principal payments on indebtedness that are not financed. Additionally, the amount of available cash may be increased by the amount of proceeds from the sale of higher and better use properties and, under certain circumstances, by 50% of the amount of net proceeds from the sale of other assets. At March 31, 2011, our entire cash balance of $254 million is available to make restricted payments.

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As of March 31, 2011, we can borrow the entire amount available under our Line of Credit, and we expect to be able to incur at least this level of additional indebtedness for the next twelve months.

Future Cash Requirements. Cash required to meet our future financial needs will be significant. In the next twelve months, we have $45 million of scheduled long-term debt principal payment requirements which we expect to fund using a combination of cash and available borrowing capacity under our $600 million line of credit. Additionally, we believe that our current cash on hand and cash flows from continuing operations will be sufficient to fund planned capital expenditures, interest payments on our indebtedness and our dividend.

The following table summarizes our sources and uses of cash for the three months ended March 31 (in millions):

	Three Months Ended March 31,
	2011			2010			Change
Sources of Cash:
Operations (A)	$	78		$	133		$	(55	)
Changes in Working Capital		(30	)		(32	)		2
Cash Distributions from Timberland Venture		28			28			—
Cash from Stock Option Exercises		7			—			7
Cash from Sale of Properties and Other Assets		—			11			(11	)
Total Sources of Cash		83			140			(57	)
Uses of Cash:
Returned to Stockholders:
Dividends		(68	)		(68	)		—
Common Stock Repurchases		(1	)		(1	)		—
Reinvest in the Business:
Capital Expenditures		(12	)		(13	)		1
Reduce Debt Obligations, net		—			(53	)		53
Total Uses of Cash		(81	)		(135	)		54
Change in Cash and Cash Equivalents	$	2		$	5		$	(3	)

(A) Calculated from the Consolidated Statements of Cash Flows by adding Depreciation, Depletion and Amortization, Basis of Real Estate Sold, Equity Earnings from Timberland Venture, Gain on Sales of Properties and Other Assets, Deferred Revenue from Long-Term Gas Leases (Net of Amortization), Deferred Income Taxes and Other Operating Activities to Net Income.

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Equity. On May 3, 2011, the Board of Directors declared a dividend of $0.42 per share, or approximately $68 million, which will be paid on May 31, 2011 to stockholders of record on May 16, 2011. Future dividends will be determined by our Board of Directors, in its sole discretion, based on consideration of a number of factors including, but not limited to, our results of operations, cash flow and capital requirements, economic conditions, tax considerations, debt covenant restrictions that may impose limitations on the company’s ability to make cash payments, borrowing capacity, changes in the prices of and demand for Plum Creek’s products, and changes in our ability to sell timberlands at attractive prices. Other factors that our Board of Directors considers include the appropriate timing of timber harvests, acquisition and divestiture opportunities, stock repurchases, debt repayment and other means by which the company could deliver value to its stockholders.

Plum Creek’s Board of Directors has authorized a common stock repurchase program that may be increased from time to time at the Board of Directors’ discretion. At March 31, 2011, $200 million is available for share repurchases under the current Board of Directors’ authorization.

Off-Balance Sheet Arrangements, Contractual Obligations, Contingent Liabilities and Commitments

The company has no off-balance sheet debt. For information on contractual obligations, see the table Contractual Obligations in “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our 2010 Annual Report on

Form 10-K.

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ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Approximately $2.1 billion (including $783 million of related party obligations) of Plum Creek’s long-term debt bears interest at fixed rates, and therefore the fair value of these instruments is affected by changes in market interest rates. We also have variable rate debt that is affected by changes in market interest rates. The following table presents contractual principal cash flows based upon maturity dates of the company’s debt obligations and the related weighted-average contractual interest rates by expected maturity dates for the fixed and variable rate debt (in millions):

	2011			2012			2013			2014			2015			Thereafter			Total		Fair Value  (A)
March 31, 2011
Fixed Rate Debt
Third Party Obligations
Principal Due(B)	$	46		$	3		$	250		$	3		$	462		$	579		$	1,343	$	1,382
Average Interest Rate(C)		5.6	%		5.5	%		5.4	%		5.2	%		5.2	%		4.7	%
Related Party Obligations
Principal Due																$	783		$	783	$	883
Interest Rate																	7.4	%
Variable Rate Debt(D)				$	350														$	350	$	348
	2010			2011			2012			2013			2014			Thereafter			Total		Fair Value
March 31, 2010
Fixed Rate Debt
Third Party Obligations
Principal Due(B)	$	3		$	308		$	3		$	250		$	3		$	467		$	1,034	$	1,095
Average Interest Rate(C)		6.7	%		6.5	%		6.2	%		6.1	%		5.9	%		5.9	%
Related Party Obligations
Principal Due																$	783		$	783	$	824
Interest Rate																	7.4	%
Variable Rate Debt							$	600											$	600	$	574

(A) The fair value of the company’s Public Debt is estimated using market quotes; the fair value of the company’s Private Debt with unrelated third parties is estimated using the same rates adjusted for the different maturities. The fair value of the company’s Note Payable to Timberland Venture is estimated using the same rates as the Public Debt adjusted by an estimated risk premium for holding company debt and the different maturity. The increase in fair value of our fixed rate debt compared to March 31, 2010 (excluding related party debt) was due primarily to the issuance of $575 million of Public Debt in November of 2010 and lower market interest rates, partially offset by principal repayments of $265 million of Private Debt during the twelve month period. The increase in the fair value of our Note Payable to Timberland Venture at March 31, 2011 compared to March 31, 2010 was due primarily to lower market interest rates. In March 2011, treasury rates and credit spreads (the difference between corporate debt rates and treasury rates) were lower than March 2010, resulting in lower market interest rates and a corresponding increase in fair value. The fair value of our floating rate term loan (variable rate debt) as of March 31, 2011 and March 31, 2010 was determined by adjusting the spread over LIBOR to a current market spread for comparable debt as of March 31, 2011 and March 31, 2010.

(B) Excludes unamortized discount of $5 million and $6 million at March 31, 2011 and 2010, respectively.

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(C) Represents the average interest rate of total fixed rate debt (excluding related party debt) outstanding at the end of the period.

(D) As of March 31, 2011, the interest rate for the $350 million term credit agreement was 0.74%. The interest rate on the term credit agreement is based on LIBOR plus 0.45%. This rate can range from LIBOR plus 0.3% to LIBOR plus 1.15% depending on our debt ratings. Not included in the above table are borrowings under our $600 million revolving line of credit of $215 million. As of March 31, 2011, the weighted-average interest rate on the $215 million of borrowings was 1.92%. The interest rate on the line of credit is based on LIBOR plus 1.70%. This rate can range from LIBOR plus 1.275% to LIBOR plus 2% depending on our debt ratings. As of April 1, 2011, all of the borrowings outstanding under our line of credit were repaid.

ITEM 4. CONTROLS AND PROCEDURES

(a) Disclosure Controls and Procedures

The company’s management, with the participation of the company’s Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of the company’s disclosure controls and procedures (as such term is defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended) as of the end of the period covered by this report. Based on that evaluation, the company’s management, including the Chief Executive Officer and Chief Financial Officer, has concluded that the company’s disclosure controls and procedures were effective as of the end of such period.

(b) Control over Financial Reporting

There have been no changes in the company’s internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934, as amended) during the quarter to which this report relates that have materially affected, or are reasonably likely to materially affect, the company’s internal control over financial reporting.

PART II – OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

None. (See also Note 10 of the Notes to Consolidated Financial Statements of Plum Creek Timber Company, Inc.).

ITEM 1A. RISK FACTORS

There have been no material changes to the company’s Risk Factors as disclosed in our Annual Report on Form 10-K for the year ended December 31, 2010, as filed with the Securities and Exchange Commission on February 25, 2011.

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ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

The following table contains information about the company’s purchases of equity securities during the first quarter of 2011:

Period	Total Number of Shares  Purchased (A)	Average Price  Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs  (B)	Maximum Number (or  Approximate Dollar Value) of Shares that May Yet Be Purchased  Under the Plans or Programs (B)
January 1, 2011 through January 31, 2011	—   shares of common stock	$	—	—   shares of common stock	$ 200 million
February 1, 2011 through February 28, 2011	31,625 shares of common stock	$	41.16	—   shares of common stock	$ 200 million
March 1, 2011 through March 31, 2011	315 shares of common stock	$	41.41	—   shares of common stock	$ 200 million
Total	31,940 shares of common stock	$	41.16	—   shares of common stock

(A) Represents shares of the company’s common stock purchased from employees in non-open market transactions. The shares of stock were effectively sold by the employees to the company in exchange for cash that was used to pay withholding taxes associated with the vesting of restricted stock unit awards granted under the company’s stock incentive plan. The price per share surrendered is based on the closing price of the company’s stock on the vesting dates of the awards.

(B) The Board of Directors, from time to time, has authorized a share repurchase program. On August 3, 2010, the Board of Directors authorized a $200 million share repurchase program, which was publicly announced on August 4, 2010. At March 31, 2011, the remaining share repurchase authorization was $200 million.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. (REMOVED AND RESERVED)

ITEM 5. OTHER INFORMATION

None.

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ITEM 6. EXHIBITS

List of Exhibits

Each exhibit set forth below in the Index to Exhibits is filed as a part of this report. All exhibits not filed herewith are incorporated herein by reference to a prior filing as indicated.

The agreements included as exhibits to this report are included to provide information about their terms and not to provide any other factual or disclosure information about the company or the other parties to the agreements. The agreements may contain representations and warranties by each of the parties to the applicable agreement that were made solely for the benefit of the other parties to the agreement and:

• should not be treated as categorical statements of fact, but rather as a way of allocating the risk among the parties if those statements prove to be inaccurate;

• may have been qualified by disclosures that were made to the other party in connection with the negotiation of the applicable agreement, which disclosures are not necessarily reflected in the agreement;

• may apply standards of materiality in a way that is different from what may be viewed as material to investors; and

• were made only as of the date of the applicable agreement or such other date or dates as may be specified in the agreement and are subject to more recent developments.

Accordingly, these representations and warranties may not describe the actual state of affairs as of the date they were made or at any other time.

INDEX TO EXHIBITS

Exhibit Designation	Nature of Exhibit
2.1	Agreement and Plan of Merger by and among Georgia-Pacific Corporation, North American Timber Corp., NPI Timber, Inc., GNN Timber, Inc., GPW Timber, Inc., LRFP Timber, Inc., NPC Timber, Inc. and Plum Creek Timber Company, Inc. (Form 8-K/A, File No. 1-10239, filed July 24, 2000). Amendment No.1 to the Agreement and Plan of Merger, dated as of June 12, 2001 (Exhibit 2.1 to Form 8-K, File No. 1-10239, filed June 14, 2001).
2.2	Contribution Agreement dated as of August 22, 2008 between Plum Creek Timber Operations I, LLC and TCG Member, LLC (Exhibit 2.1 to Form 8-K, File No. 1-10239, filed August 27, 2008).
2.3	Limited Liability Company Agreement of Southern Diversified Timber, LLC dated as of October 1, 2008 between Plum Creek Timber Operations I, LLC and TCG Member, LLC (Exhibit 2.2 to Form 8-K, File No. 1-10239, filed October 7, 2008).

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3.1	Restated Certificate of Incorporation of Plum Creek Timber Company, Inc., as amended (Exhibit 3.1 to Form 10-Q, File No. 1-10239, for the quarter ended June 30, 2009).
3.2	Amended and Restated By-laws of Plum Creek Timber Company, Inc., as amended (Exhibit 3.2 to Form 10-K, File No. 1-10239, for the year ended December 31, 2010).
3.3	Amended and Restated Agreement of Plum Creek Timberlands, L.P. (Exhibit 3.3 to Form 10-K, File No. 1-10239, for the year ended December 31, 2010).
12.1	Statements regarding computation of ratios.
31.1	Certification of Rick R. Holley pursuant to Rules 13a-14(a) and 15d-14(a) of the Securities Exchange Act of 1934, as amended.
31.2	Certification of David W. Lambert pursuant to Rules 13a-14(a) and 15d-14(a) of the Securities Exchange Act of 1934, as amended.
32.1	Certification of Rick R. Holley, President and Chief Executive Officer, pursuant to Rules 13a-14(b) and 15d-14(b) of the Securities Exchange Act of 1934, as amended, and 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2	Certification of David W. Lambert, Senior Vice President and Chief Financial Officer, pursuant to Rules 13a-14(b) and 15d-14(b) of the Securities Exchange Act of 1934, as amended, and 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes- Oxley Act of 2002.
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

PLUM CREEK TIMBER COMPANY, INC.
(Registrant)
By:	/s/ DAVID W. LAMBERT
	DAVID W. LAMBERT
	Senior Vice President and Chief Financial Officer (Duly Authorized Officer and Principal Financial Officer)

Date: May 4, 2011

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