OMB APPROVAL

OMB Number: 3235-0578

Expires: April 30, 2013

Estimated average burden       

hours per response: 5.6

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED MANAGEMENT
INVESTMENT COMPANY

Investment Company Act file number 811-07344

Invesco California Insured Municipal Income Trust

(Exact name of registrant as specified in charter)

1555 Peachtree Street, N.E., Atlanta, Georgia	30309
(Address of principal executive offices)	(Zip code)

Philip A. Taylor 1555 Peachtree Street, N.E., Atlanta, Georgia 30309

(Name and address of agent for service)

Registrant’s telephone number, including area code: (713) 626-1919

Date of fiscal year end: 2/28

Date of reporting period: 5/31/11

Item 1. Schedule of Investments.

Invesco California Insured Municipal Income Trust
Quarterly Schedule of Portfolio Holdings
May 31, 2011

invesco.com/us   MS-CE-CAIMI-QTR-1   05/11   Invesco Advisers, Inc.

Schedule of Investments
May 31, 2011
(Unaudited)

						Principal
	Interest			Maturity		Amount
	Rate			Date		(000)		Value
Municipal Obligations—145.68%
California—142.84%
Alameda (County of) Joint Powers Authority (Juvenile Justice Refunding); Series 2008 A, Lease RB (INS-AGM) (a)		5.00	%		12/01/25	$	750	$	781,005
Alhambra Unified School District (Election of 2004);
Series 2009 B, Unlimited Tax CAB GO Bonds (INS-AGC) (a)(b)		0.00	%		08/01/35		840		170,848
Series 2009 B, Unlimited Tax CAB GO Bonds (INS-AGC) (a)(b)		0.00	%		08/01/36		1,355		238,114
Alvord Unified School District (Election of 2007); Series 2008 A, Unlimited Tax GO Bonds (INS-AGM) (a)		5.00	%		08/01/28		585		592,517
Anaheim (City of) Public Financing Authority (Electric System Distribution Facilities); Series 2007 A, RB (INS-NATL) (a)		4.50	%		10/01/37		2,000		1,831,660
Anaheim City School District (Election of 2002); Series 2007, Unlimited Tax CAB GO Bonds (INS-NATL) (a)(b)		0.00	%		08/01/24		4,970		2,181,084
Arcadia Unified School District (Election of 2006); Series 2007 A, Unlimited Tax GO Bonds (INS-AGM) (a)		5.00	%		08/01/37		1,000		1,005,070
Bay Area Toll Authority (San Francisco Bay Area);
Series 2009 F-1, Toll Bridge RB (c)		5.25	%		04/01/26		2,070		2,266,464
Series 2009 F-1, Toll Bridge RB (c)		5.25	%		04/01/29		2,300		2,450,949
Beverly Hills Unified School District (Election of 2008);
Series 2009, Unlimited Tax CAB GO Bonds (b)		0.00	%		08/01/26		600		260,400
Series 2009, Unlimited Tax CAB GO Bonds (b)		0.00	%		08/01/31		1,145		342,160
California (State of) Department of Water Resources (Central Valley); Series 2008 AE, Water System RB		5.00	%		12/01/29		1,000		1,065,870
California (State of) Health Facilities Financing Authority (Children’s Hospital Los Angeles); Series 2010, RB (INS-AGM) (a)		5.25	%		07/01/38		1,850		1,722,479
California (State of) Health Facilities Financing Authority (Scripps Health); Series 2010 A, RB		5.00	%		11/15/36		1,000		910,280
California (State of) Health Facilities Financing Authority (Sutter Health); Series 2011 B, RB		5.50	%		08/15/26		750		781,830
California (State of) Infrastructure & Economic Development Bank (California Science Center Phase II); Series 2006 B, RB (INS-NATL) (a)		5.00	%		05/01/31		1,000		852,580
California (State of) Municipal Finance Authority (Community Hospitals of Central California Obligated Group); Series 2007, COP		5.00	%		02/01/19		965		960,686
California (State of) Municipal Finance Authority (Eisenhower Medical Center); Series 2010 A, RB		5.75	%		07/01/40		1,000		927,010
California (State of) Pollution Control Financing Authority (San Jose Water Co.); Series 2010 A, RB		5.10	%		06/01/40		1,250		1,166,813
California (State of) Public Works Board (Department of Mental Health Coalinga State Hospital); Series 2004 A, Lease RB		5.00	%		06/01/25		690		682,134
California (State of) Statewide Communities Development Authority (American Baptist Homes of the West); Series 2010, RB		6.25	%		10/01/39		1,000		982,950
California (State of) Statewide Communities Development Authority (Cottage Health System Obligated Group); Series 2010, RB		5.25	%		11/01/30		1,075		1,071,066
California (State of) Transit Finance Authority (California Transit Variable Rate Finance Program); Series 1997, VRD RB (INS-AGM) (a)(d)		0.60	%		10/01/27		2,500		2,500,000
California State University;
Series 2003 A, Systemwide RB (INS-NATL) (a)		5.25	%		11/01/21		2,000		2,126,420
Series 2005 A, Systemwide RB (INS-AMBAC) (a)		5.00	%		11/01/35		1,500		1,457,700
Series 2008 A, Systemwide RB (INS-AGM) (a)		5.00	%		11/01/39		1,000		963,970
Series 2009 A, Systemwide RB		5.25	%		11/01/38		1,000		999,230
Camarillo Public Finance Authority; Series 2005, Waste Water RB (INS-AMBAC) (a)		5.00	%		06/01/36		1,000		972,880
Campbell Union High School District;
Series 2008, Unlimited Tax GO Bonds (INS-AGC) (a)		5.00	%		08/01/35		500		495,465
Series 2008, Unlimited Tax GO Bonds (INS-AGC) (a)		5.00	%		08/01/38		1,620		1,592,703
Capistrano Unified School District (Community Facilities District); Series 2005, Ref. Special Tax Bonds (INS-NATL) (a)		5.00	%		09/01/29		1,000		911,610

See accompanying notes which are an integral part of this schedule.

Invesco California Insured Municipal Income Trust

						Principal
	Interest			Maturity		Amount
	Rate			Date		(000)		Value
California—(continued)
Chino Basin Regional Financing Authority (Inland Empire Utilities Agency); Series 2008 A, RB (INS-AMBAC) (a)		5.00	%		11/01/33	$	1,000	$	1,005,680
Clovis Unified School District (Election of 2004); Series 2004 A, Unlimited Tax CAB GO Bonds (INS-NATL) (a)(b)		0.00	%		08/01/29		300		96,876
Contra Costa (County of) Water District;
Series 2002 L, Ref. RB (INS-AGM) (a)		5.00	%		10/01/20		5,060		5,295,695
Series 2002 L, Ref. RB (INS-AGM) (a)		5.00	%		10/01/21		2,135		2,229,815
Culver (City of) Redevelopment Agency; Series 2005 A, Ref. Tax Allocation Bonds (INS-AMBAC) (a)		5.00	%		11/01/25		2,000		1,795,340
Desert Community College District (Election of 2004); Series 2007 C, Unlimited Tax GO Bonds (INS-AGM) (a)		5.00	%		08/01/37		1,545		1,546,112
Dry Creek Joint Elementary School District (Election of 2008); Series 2009 E, Unlimited Tax CAB GO Bonds (b)		0.00	%		08/01/39		4,420		715,598
Eastern Municipal Water District; Series 2006 A, Water & Sewer Revenue COP (INS-NATL) (a)		5.00	%		07/01/32		1,000		1,006,870
El Segundo Unified School District (Election of 2008); Series 2009 A, Unlimited Tax CAB GO Bonds (b)		0.00	%		08/01/31		1,570		421,357
Fontana Unified School District (Election of 2006); Series 2008 B, Unlimited Tax CAB GO Bonds (INS-AGM) (a)(b)		0.00	%		08/01/29		2,560		795,264
Foothill-De Anza Community College District; Series 2011 C, Unlimited Tax GO Bonds		5.00	%		08/01/40		3,300		3,380,421
Golden State Tobacco Securitization Corp.; Series 2005 A, Enhanced Tobacco Settlement Asset-Backed RB (INS-FGIC) (a)		5.00	%		06/01/38		1,500		1,298,880
Grant Joint Union High School District (Election of 2006); Series 2008, Unlimited Tax GO Bonds (INS-AGM) (a)		5.00	%		08/01/23		1,000		1,072,410
Grossmont Union High School District (Election of 2004); Series 2006, Unlimited Tax CAB GO Bonds (INS-NATL) (a)(b)		0.00	%		08/01/24		2,475		1,151,321
Huntington Beach Union High School District (Election of 2004); Series 2004, Unlimited Tax GO Bonds (INS-AGM) (a)		5.00	%		08/01/27		1,250		1,271,875
Irvine (City of) (Reassessment District No. 85-7); Series 2007 A, VRD Limited Obligation Improvement Special Assessment Bonds (INS-AGM) (a)(d)		0.80	%		09/02/32		3,800		3,800,000
Kern (County of) Board of Education; Series 2006 A, Ref. COP (INS-NATL) (a)		5.00	%		06/01/31		2,000		1,787,040
Kern (County of) Water Agency Improvement District No. 4; Series 2008 A, COP (INS-AGC) (a)		5.00	%		05/01/28		770		786,440
La Quinta (City of) Financing Authority; Series 2004 A, Tax Allocation RB (INS-AMBAC) (a)		5.25	%		09/01/24		3,000		2,874,810
La Quinta (City of) Redevelopment Agency; Series 2002, Tax Allocation Bonds (INS-AMBAC) (a)		5.00	%		09/01/22		2,000		1,943,200
Long Beach (City of); Series 2005 A, Ref. Harbor RB (INS-NATL) (a)(e)		5.00	%		05/15/24		2,750		2,777,912
Los Angeles (City of) Department of Airports (Los Angeles International Airport); Series 2010 A, Sr. RB		5.00	%		05/15/35		1,000		1,008,960
Los Angeles (City of) Department of Water & Power;
Series 2001 A Subseries A-1, Power System RB (INS-AGM) (a)		5.25	%		07/01/21		4,000		4,012,560
Series 2003 A Subseries A-2, Power System RB (INS-NATL) (a)		5.00	%		07/01/27		5,000		5,092,300
Series 2006 Subseries A-1, Waterworks RB (INS-AMBAC) (a)		5.00	%		07/01/36		1,000		1,011,360
Series 2007 Subseries A-1, Power System RB (INS-AMBAC) (a)		5.00	%		07/01/39		1,200		1,214,064
Los Angeles (City of); Series 2003 B, Ref. Wastewater System RB (INS-AGM) (a)		5.00	%		06/01/22		2,825		2,979,499
Los Angeles (County of) Metropolitan Transportation Authority; Series 2005 A, Proposition A First Tier Sr. Sales Tax RB (INS-AMBAC) (a)		5.00	%		07/01/35		2,000		2,035,720
Los Angeles Unified School District (Election of 2004); Series 2006 F, Unlimited Tax GO Bonds (INS-FGIC) (a)		5.00	%		07/01/30		2,000		2,031,740
Menifee Union School District (Election of 2008); Series 2009 C, Unlimited Tax CAB GO Bonds (INS-AGC) (a)(b)		0.00	%		08/01/34		850		185,487
Metropolitan Water District of Southern California;
Series 2003 B-1, Water RB (INS-NATL) (a)		5.00	%		10/01/33		4,000		4,058,200
Series 2003 B-1, Water RB (INS-NATL) (a)		5.00	%		10/01/36		2,000		2,019,360
Series 2009 B, Ref. Water RB (c)		5.00	%		07/01/27		3,755		4,080,934
Milpitas (City of) Redevelopment Agency; Series 2003, Tax Allocation RB (INS-NATL) (a)		5.00	%		09/01/22		3,000		2,853,870
Modesto (City of) (Community Center Refinancing); Series 1993 A, COP (INS-AMBAC) (a)		5.00	%		11/01/23		5,000		4,489,400

See accompanying notes which are an integral part of this schedule.

Invesco California Insured Municipal Income Trust

						Principal
	Interest			Maturity		Amount
	Rate			Date		(000)		Value
California—(continued)
Modesto (City of) Irrigation District (Capital Improvements); Series 2001 A, COP (INS-AGM) (a)		5.00	%		07/01/26	$	4,000	$	4,052,800
Montebello Unified School District (Election of 2004); Series 2009 A-1, Unlimited Tax GO Bonds (INS-AGC) (a)		5.25	%		08/01/34		1,000		1,010,180
Moreland School District (Crossover); Series 2014 C, Ref. Unlimited Tax CAB GO Bonds (INS-AMBAC) (a)(b)		0.00	%		08/01/29		935		287,410
Murrieta Valley Unified School District Public Financing Authority (Election of 2006); Series 2008, Unlimited Tax CAB GO Bonds (INS-AGM) (a)(b)		0.00	%		09/01/31		3,150		840,798
Norwalk-La Mirada Unified School District; Series 2005 B, Unlimited Tax CAB GO Bonds (INS-AGM) (a)(b)		0.00	%		08/01/29		6,000		1,858,980
Oak Grove School District (Election of 2008); Series 2009 A, Unlimited Tax CAB GO Bonds (b)		0.00	%		08/01/28		670		224,571
Oakland (City of) (Measure DD); Series 2003 A, Unlimited Tax GO Bonds (INS-NATL) (a)		5.00	%		01/15/33		3,000		2,991,960
Oakland (City of) Joint Powers Financing Authority (Oakland Administration Buildings); Series 2008 B, Ref. Lease RB (INS-AGC) (a)		5.00	%		08/01/25		750		762,368
Oakland (City of); Series 2004 A, Sewer RB (INS-AGM) (a)		5.00	%		06/15/25		2,355		2,415,288
Oakland (Port of);
Series 2002 L, RB (e)(f)(g)		5.00	%		11/01/12		85		90,608
Series 2002 L, RB (INS-NATL) (a)(e)		5.00	%		11/01/21		665		669,223
Orange (County of) Water District; Series 2003 B, COP (INS-NATL) (a)		5.00	%		08/15/34		750		756,563
Planada Elementary School District (Election of 2008); Series 2009 B, Unlimited Tax CAB GO Bonds (INS-AGC) (a)(b)		0.00	%		07/01/49		6,345		511,597
Poway Redevelopment Agency (Paguay Redevelopment); Series 2003 A, Tax Allocation Bonds (INS-NATL) (a)		5.25	%		06/15/23		3,960		3,792,888
Poway Unified School District Public Financing Authority; Series 2007, Special Tax RB (INS-AMBAC) (a)		4.63	%		09/15/42		1,500		1,215,210
Redding (City of); Series 2008 A, Electric System Revenue COP (INS-AGM) (a)		5.00	%		06/01/27		365		372,888
Riverside (City of); Series 2008 D, Electric RB (INS-AGM) (a)		5.00	%		10/01/28		1,585		1,629,459
Riverside (City of); Series 2008 B, Water RB (INS-AGM) (a)		5.00	%		10/01/33		1,000		1,019,920
Sacramento (City of) Municipal Utility District; Series 2002 Q, Ref. Electric RB (INS-AGM) (a)		5.00	%		08/15/28		2,495		2,509,745
Sacramento (County of); Series 2010, Sr. Airport System RB		5.00	%		07/01/40		1,450		1,386,823
San Diego (County of) Regional Airport Authority; Series 2010 A, Sub. Airport RB		5.00	%		07/01/40		1,000		952,160
San Diego (County of) Water Authority;
Series 2004 A, Water Revenue COP (INS-AGM) (a)(c)		5.00	%		05/01/29		4,000		4,084,600
Series 2008 A, Water Revenue COP (INS-AGM) (a)		5.00	%		05/01/28		1,250		1,307,537
San Francisco (City & County of) (Laguna Honda Hospital);
Series 2005 I, Unlimited Tax GO Bonds (INS-AGM) (a)		5.00	%		06/15/30		4,000		4,053,320
Series 2008 R-3, Ref. Unlimited Tax GO Bonds (INS-AGC) (a)		5.00	%		06/15/28		355		363,257
Series 2008 R-3, Ref. Unlimited Tax GO Bonds (INS-AGC) (a)(c)		5.00	%		06/15/28		5,500		5,627,930
San Francisco (City & County of) Airports Commission (San Francisco International Airport); Series 2010 F, Second Series RB		5.00	%		05/01/40		2,000		1,944,800
San Francisco (City & County of) Public Utilities Commission; Series 2001 A, Water RB (INS-AGM) (a)		5.00	%		11/01/31		5,000		5,012,000
San Jose (City of) Financing Authority (Civic Center); Series 2002 B, Lease RB (INS-AMBAC) (a)		5.00	%		06/01/37		8,000		7,657,920
San Jose (City of); Series 2001 A, Airport RB (INS-NATL) (a)		5.00	%		03/01/25		4,000		4,000,320
San Luis Obispo (County of) Financing Authority (Lopez Dam Improvement); Series 2011 A, Ref. RB (INS-AGM) (a)		5.00	%		08/01/30		2,000		2,000,660
School Facilities Financing Authority (Grant Joint Union High School District);
Series 2008 A, GO CAB RB (INS-AGM) (a)(b)		0.00	%		08/01/26		1,700		669,443
Series 2008 A, GO CAB RB (INS-AGM) (a)(b)		0.00	%		08/01/29		2,345		727,185
Simi Valley (City of) (Capital Improvement); Series 2004, COP (INS-AMBAC) (a)		5.00	%		09/01/30		1,000		906,250
Simi Valley Unified School District (Election of 2004); Series 2007 C, Unlimited Tax CAB GO Bonds (INS-AGM) (a)(b)		0.00	%		08/01/29		5,000		1,566,150
Turlock (City of) Irrigation District; Series 2010 A, Ref. RB		5.00	%		01/01/35		1,250		1,195,738
Tustin Unified School District (Election of 2002-School Facilities Improvement District No. 2002-1); Series 2008 C, Unlimited Tax GO Bonds (INS-AGM) (a)		5.00	%		06/01/25		770		813,767
Twin Rivers Unified School District (School Facility Bridge Funding Program); Series 2007, COP (INS-AGM) (a)(f)		3.50	%		05/31/13		2,000		2,000,800
Twin Rivers Unified School District; Series 2009, Unlimited Tax CAB GO BAN (b)		0.00	%		04/01/14		700		645,435

See accompanying notes which are an integral part of this schedule.

Invesco California Insured Municipal Income Trust

						Principal
	Interest			Maturity		Amount
	Rate			Date		(000)		Value
California—(continued)
University of California (Multi Purpose); Series 2003, (INS-AGM) (a)		5.00	%		09/01/23	$	95	$	96,760
University of California (Multi Purpose); Series 2003, RB (f)(g)		5.00	%		09/01/11		4,905		5,013,253
University of California (UCLA Medical Center); Series 2004 A, RB (INS-AMBAC) (a)		5.25	%		05/15/30		1,225		1,161,582
University of California;
Series 2003 B, General RB (INS-AMBAC) (a)		5.00	%		05/15/22		2,000		2,110,540
Series 2005 B, Limited RB (INS-AGM) (a)		5.00	%		05/15/30		1,000		1,015,190
Series 2007 A, Medical Center Pooled RB (INS-NATL) (a)		4.50	%		05/15/37		4,000		3,490,360
Series 2009 Q, General RB (c)(h)		5.00	%		05/15/34		4,345		4,415,041
Val Verde Unified School District (Refunding & School Construction); Series 2005 B, COP (INS-NATL) (a)		5.00	%		01/01/35		1,330		1,071,820
West Basin Municipal Water District; Series 2008 B, Ref. COP (INS-AGC) (a)		5.00	%		08/01/27		770		787,864
William S. Hart Union High School District (Election of 2008); Series 2009 A, Unlimited Tax CAB GO Bonds (b)		0.00	%		08/01/32		5,335		1,251,218
Yosemite Community College District (Election of 2004);
Series 2008, Unlimited Tax CAB GO Bonds (INS-AGM) (a)(b)		0.00	%		08/01/22		1,465		783,731
Series 2008 C, Unlimited Tax GO Bonds (INS-AGM) (a)(c)		5.00	%		08/01/32		7,625		7,704,529
									212,220,756
Guam—0.19%
Guam (Territory of) (Section 30); Series 2009 A, Limited Obligation RB		5.63	%		12/01/29		285		284,838
Puerto Rico—1.51%
Puerto Rico (Commonwealth of) Electric Power Authority; Series 2010 XX, Power RB		5.25	%		07/01/40		600		567,528
Puerto Rico Sales Tax Financing Corp.;
Series 2009 A, First Sub. Sales Tax RB (f)(g)		5.00	%		08/01/11		720		725,811
Series 2010 C, First Sub. Sales Tax RB		5.00	%		08/01/35		1,000		939,870
									2,233,209
Virgin Islands—1.14%
Virgin Islands (Government of) Public Finance Authority (Matching Fund Loan Note — Diageo); Series 2009 A, Sub. RB		6.63	%		10/01/29		725		758,502
Virgin Islands (Government of) Public Finance Authority (Matching Fund Loan Note); Series 2010 A, Sr. Lien RB		5.00	%		10/01/29		1,000		934,970
									1,693,472
TOTAL INVESTMENTS(i)—145.68% (Cost $218,483,037)									216,432,275
OTHER ASSETS LESS LIABILITIES—(2.71)%									(4,032,582	)
Floating Rate Note Obligations—(12.04)%
Notes with interest rates ranging from 0.15% to 0.24% at 05/31/11 and contractual maturities of collateral ranging from 04/01/26 to 05/15/34 (See Note 1D) (j)									(17,880,000	)
PREFERRED SHARES—(30.93)%									(45,950,000	)
NET ASSETS APPLICABLE TO COMMON SHARES—100.00%								$	148,569,693

See accompanying notes which are an integral part of this schedule.

Invesco California Insured Municipal Income Trust

Investment Abbreviations:

AGC	— Assured Guaranty Corp.
AGM	— Assured Guaranty Municipal Corp.
AMBAC	— AMBAC Assurance Corp.(AMBAC filed for bankruptcy on November 8, 2010.)
BAN	— Bond Anticipation Notes
CAB	— Capital Appreciation Bonds
COP	— Certificates of Participation
FGIC	— Financial Guaranty Insurance Co.
GO	— General Obligation
INS	— Insurer
NATL	— National Public Finance Guarantee Corp.
RB	— Revenue Bonds
Ref.	— Refunding
Sr.	— Senior
Sub.	— Subordinated
VRD	— Variable Rate Demand

Notes to Schedule of Investments:
(a)	Principal and/or interest payments are secured by the bond insurance company listed.
(b)	Zero coupon bond issued at a discount.
(c)	Underlying security related to Dealer Trusts entered into by the Trust. See Note 1D.
(d)	Demand security payable upon demand by the Fund at specified time intervals no greater than thirteen months. Interest rate is redetermined periodically. Rate shown is the rate in effect on May 31, 2011.
(e)	Security subject to the alternative minimum tax.
(f)	Security has an irrevocable call by the issuer or mandatory put by the holder. Maturity date reflects such call or put.
(g)	Advance refunded; secured by an escrow fund of U.S. Government obligations or other highly rated collateral.
(h)	Security is subject to a shortfall agreement which may require the Trust to pay amounts to a counterparty in the event of a significant decline in the market value of the security underlying the Dealer Trusts. In case of a shortfall, the maximum potential amount of payments the Trust could ultimately be required to make under the agreement is $2,895,000. However, such shortfall payment would be reduced by the proceeds from the sale of the security underlying the Dealer Trusts.
(i)	This table provides a listing of those entities that have either issued, guaranteed, backed or otherwise enhanced the credit quality of more than 5% of the securities held in the portfolio. In instances where the entity has guaranteed, backed or otherwise enhanced the credit quality of a security, it is not primarily responsible for the issuer’s obligations but may be called upon to satisfy the issuer’s obligations.

Entities	Percentage
AGM		35.6	%
NATL		21.0
AMBAC		14.8
AGC		5.8

^(j) Floating rate note obligations related to securities held. The interest rates shown reflect the rates in effect at May 31, 2011. At May 31, 2011, the Trust’s investments with a value of $17,880,000 are held by Dealer Trusts and serve as collateral for the $30,630,447 in the floating rate note obligations outstanding at that date.

See accompanying notes which are an integral part of this schedule.

Invesco California Insured Municipal Income Trust

Notes to Quarterly Schedule of Portfolio Holdings
May 31, 2011
(Unaudited)

NOTE 1 — Significant Accounting Policies

A. Security Valuations — Securities, including restricted securities, are valued according to the following policy.

     Securities are fair valued using an evaluated quote provided by an independent pricing service approved by the Board of Trustees. Evaluated quotes provided by the pricing service may be determined without exclusive reliance on quoted prices and may reflect appropriate factors such as institution-size trading in similar groups of securities, yield, quality, coupon rate, maturity, type of issue, individual trading characteristics and other market data. Short-term obligations, including commercial paper, having 60 days or less to maturity are recorded at amortized cost which approximates value. Securities with a demand feature exercisable within one to seven days are valued at par. Debt securities are subject to interest rate and credit risks. In addition, all debt securities involve some risk of default with respect to interest and principal payments.

     Securities for which market quotations either are not readily available or are unreliable are valued at fair value as determined in good faith by or under the supervision of the Trust’s officers following procedures approved by the Board of Trustees. Some of the factors which may be considered in determining fair value are fundamental analytical data relating to the investment; the nature and duration of any restrictions on transferability or disposition; trading in similar securities by the same issuer or comparable companies; relevant political, economic or issuer specific news; and other relevant factors under the circumstances.

     Valuations change in response to many factors including the historical and prospective earnings of the issuer, the value of the issuer’s assets, general economic conditions, interest rates, investor perceptions and market liquidity. Because of the inherent uncertainties of valuation, the values reflected in the financial statements may materially differ from the value received upon actual sale of those investments.

B. Securities Transactions and Investment Income — Securities transactions are accounted for on a trade date basis. Realized gains or losses on sales are computed on the basis of specific identification of the securities sold. Interest income is recorded on the accrual basis from settlement date. Dividend income (net of withholding tax, if any) is recorded on the ex-dividend date. Bond premiums and discounts are amortized and/or accreted for financial reporting purposes.

     The Trust may periodically participate in litigation related to Trust investments. As such, the Trust may receive proceeds from litigation settlements. Any proceeds received are included in the Statement of Operations as realized gain (loss) for investments no longer held and as unrealized gain (loss) for investments still held.

     Brokerage commissions and mark ups are considered transaction costs and are recorded as an increase to the cost basis of securities purchased and/or a reduction of proceeds on a sale of securities. Such transaction costs are included in the determination of net realized and unrealized gain (loss) from investment securities reported in the Statement of Operations and the Statement of Changes in Net Assets and the net realized and unrealized gains (losses) on securities per share in the Financial Highlights. Transaction costs are included in the calculation of the Trust’s net asset value and, accordingly, they reduce the Trust’s total returns. These transaction costs are not considered operating expenses and are not reflected in net investment income reported in the Statement of Operations and Statement of Changes in Net Assets, or the net investment income per share and ratios of expenses and net investment income reported in the Financial Highlights, nor are they limited by any expense limitation arrangements between the Trust and the investment adviser.

C.

Country Determination — For the purposes of making investment selection decisions and presentation in the Schedule of Investments, the investment adviser may determine the country in which an issuer is located and/or credit risk exposure based on various factors. These factors include the laws of the country under which the issuer is organized, where the issuer maintains a principal office, the country in which the issuer derives 50% or more of its total revenues and the country that has the primary market for the issuer’s securities, as well as other criteria. Among the other criteria that may be evaluated for making this determination are the country in which the issuer maintains 50% or more of its assets, the type of security, financial guarantees and enhancements, the nature of the collateral and the sponsor organization. Country of issuer and/or credit risk exposure has been determined to be the United States of America, unless otherwise noted.

D.

Floating Rate Note Obligations — The Trust invests in inverse floating rate securities, such as Residual Interest Bonds (“RIBs”) or Tender Option Bonds (“TOBs”) for investment purposes and to enhance the yield of the Trust. Inverse floating rate investments tend to underperform the market for fixed rate bonds in a rising interest rate environment, but tend to outperform the market for fixed rate bonds when interest rates decline or remain relatively stable. Such

Invesco California Insured Municipal Income Trust

transactions may be purchased in the secondary market without first owning the underlying bond or by the sale of fixed rate bonds by the Trust to special purpose trusts established by a broker dealer (“Dealer Trusts”) in exchange for cash and residual interests in the Dealer Trusts’ assets and cash flows, which are in the form of inverse floating rate securities. The Dealer Trusts finance the purchases of the fixed rate bonds by issuing floating rate notes to third parties and allowing the Trust to retain residual interest in the bonds. The floating rate notes issued by the Dealer Trusts have interest rates that reset weekly and the floating rate note holders have the option to tender their notes to the Dealer Trusts for redemption at par at each reset date. The residual interests held by the Trust (inverse floating rate investments) include the right of the Trust (1) to cause the holders of the floating rate notes to tender their notes at par at the next interest rate reset date, and (2) to transfer the municipal bond from the Dealer Trusts to the Trust, thereby collapsing the Dealer Trusts.

     TOBs are presently classified as private placement securities. Private placement securities are subject to restrictions on resale because they have not been registered under the Securities Act of 1933, as amended or are otherwise not readily marketable. As a result of the absence of a public trading market for these securities, they may be less liquid than publicly traded securities. Although these securities may be resold in privately negotiated transactions, the prices realized from these sales could be less than those originally paid by the Trust or less than what may be considered the fair value of such securities.

     The Trust accounts for the transfer of bonds to the Dealer Trusts as secured borrowings, with the securities transferred remaining in the Trust’s investment assets, and the related floating rate notes reflected as Trust liabilities under the caption Floating rate note obligations on the Statement of Assets and Liabilities. The Trust records the interest income from the fixed rate bonds under the caption Interest and records the expenses related to floating rate obligations and any administrative expenses of the Dealer Trusts a component of Interest, facilities and maintenance fees on the Statement of Operations.

     The Trust generally invests in inverse floating rate securities that include embedded leverage, thus exposing the Trust to greater risks and increased costs. The primary risks associated with inverse floating rate securities are varying degrees of liquidity and the changes in the value of such securities in response to changes in market rates of interest to a greater extent than the value of an equal principal amount of a fixed rate security having similar credit quality, redemption provisions and maturity which may cause the Trust’s net asset value to be more volatile than if it had not invested in inverse floating rate securities. In certain instances, the short-term floating rate interests created by the special purpose trust may not be able to be sold to third parties or, in the case of holders tendering (or putting) such interests for repayment of principal, may not be able to be remarketed to third parties. In such cases, the special purpose trust holding the long-term fixed rate bonds may be collapsed. In the case of RIBs or TOBs created by the contribution of long-term fixed income bonds by the Trust, the Trust will then be required to repay the principal amount of the tendered securities. During times of market volatility, illiquidity or uncertainty, the Trust could be required to sell other portfolio holdings at a disadvantageous time to raise cash to meet that obligation.

E. Other Risks — The value of, payment of interest on, repayment of principal for and the ability to sell a municipal security may be affected by constitutional amendments, legislative enactments, executive orders, administrative regulations, voter initiatives and the economics of the regions in which the issuers are located.

     Since, many municipal securities are issued to finance similar projects, especially those relating to education, health care, transportation and utilities, conditions in those sectors can affect the overall municipal securities market and a Trust’s investments in municipal securities.

     There is some risk that a portion or all of the interest received from certain tax-free municipal securities could become taxable as a result of determinations by the Internal Revenue Service.

NOTE 2 — Additional Valuation Information

Generally Accepted Accounting Principles (“GAAP”) defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date, under current market conditions. GAAP establishes a hierarchy that prioritizes the inputs to valuation methods giving the highest priority to readily available unadjusted quoted prices in an active market for identical assets (Level 1) and the lowest priority to significant unobservable inputs (Level 3) generally when market prices are not readily available or are unreliable. Based on the valuation inputs, the securities or other investments are tiered into one of three levels. Changes in valuation methods may result in transfers in or out of an investment’s assigned level:

Level 1 —	Prices are determined using quoted prices in an active market for identical assets.
Level 2 —	Prices are determined using other significant observable inputs. Observable inputs are inputs that other market participants may use in pricing a security. These may include quoted prices for similar securities,

Invesco California Insured Municipal Income Trust

interest rates, prepayment speeds, credit risk, yield curves, loss severities, default rates, discount rates, volatilities and others.

Level 3 —

Prices are determined using significant unobservable inputs. In situations where quoted prices or observable inputs are unavailable (for example, when there is little or no market activity for an investment at the end of the period), unobservable inputs may be used. Unobservable inputs reflect the Trust’s own assumptions about the factors market participants would use in determining fair value of the securities or instruments and would be based on the best available information.

     The following is a summary of the tiered valuation input levels, as of May 31, 2011. The level assigned to the securities valuations may not be an indication of the risk or liquidity associated with investing in those securities. Because of the inherent uncertainties of valuation, the values reflected in the financial statements may materially differ from the value received upon actual sale of those investments.

     During the three months ended May 31, 2011, there were no significant transfers between investment levels.

	Level 1		Level 2		Level 3		Total
Municipal Obligations	$	—	$	216,432,275	$	—	$	216,432,275

NOTE 3 — Investment Securities

The aggregate amount of investment securities (other than short-term securities, U.S. Treasury obligations and money market funds, if any) purchased and sold by the Trust during the three months ended May 31, 2011 was $7,778,138 and $3,223,005, respectively. Cost of investments on a tax basis includes the adjustments for financial reporting purposes as of the most recently completed Federal income tax reporting period-end.

Unrealized Appreciation (Depreciation) of Investment Securities on a Tax Basis

Aggregate unrealized appreciation of investment securities	$	4,123,141
Aggregate unrealized (depreciation) of investment securities		(6,030,878	)
Net unrealized (depreciation) of investment securities	$	(1,907,737	)
Cost of investments for tax purposes is $218,340,012

Invesco California Insured Municipal Income Trust

Item 2. Controls and Procedures.

(a)

As of June 10, 2011, an evaluation was performed under the supervision and with the participation of the officers of the Registrant, including the Principal Executive Officer (“PEO”) and Principal Financial Officer (“PFO”), to assess the effectiveness of the Registrant’s disclosure controls and procedures, as that term is defined in Rule 30a-3(c) under the Investment Company Act of 1940 (“Act”), as amended. Based on that evaluation, the Registrant’s officers, including the PEO and PFO, concluded that, as of June 10, 2011, the Registrant’s disclosure controls and procedures were reasonably designed so as to ensure: (1) that information required to be disclosed by the Registrant on Form N-Q is recorded, processed, summarized and reported within the time periods specified by the rules and forms of the Securities and Exchange Commission; and (2) that material information relating to the Registrant is made known to the PEO and PFO as appropriate to allow timely decisions regarding required disclosure.

(b)

There have been no changes in the Registrant’s internal control over financial reporting (as defined in Rule 30a-3(d) under the Act) that occurred during the Registrant’s last fiscal quarter that have materially affected, or are reasonably likely to materially affect, the Registrant’s internal control over financial reporting.

Item 3. Exhibits.

Certifications of PEO and PFO as required by Rule 30a-2(a) under the Investment Company Act of 1940.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Registrant: Invesco California Insured Municipal Income Trust

By:	/s/ Philip A. Taylor
	Philip A. Taylor
	Principal Executive Officer
Date:	July 29, 2011

Pursuant to the requirements of the Securities and Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated.

By:	/s/ Philip A. Taylor
	Philip A. Taylor
	Principal Executive Officer
Date:	July 29, 2011
By:	/s/ Sheri Morris
	Sheri Morris
	Principal Financial Officer
Date:	July 29, 2011

EXHIBIT INDEX

Certifications of Principal Executive Officer (“PEO”) and Principal Financial Officer (“PFO”) as required by Rule 30a-2(a) under the Investment Company Act of 1940, as amended.