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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0001104659-08-054916.txt : 20080825
<SEC-HEADER>0001104659-08-054916.hdr.sgml : 20080825
<ACCEPTANCE-DATETIME>20080825181519
ACCESSION NUMBER:		0001104659-08-054916
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20080825
FILED AS OF DATE:		20080825
DATE AS OF CHANGE:		20080825

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Pinnacle Gas Resources, Inc.
		CENTRAL INDEX KEY:			0001362120
		STANDARD INDUSTRIAL CLASSIFICATION:	CRUDE PETROLEUM & NATURAL GAS [1311]
		IRS NUMBER:				300182582
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1 E. ALGER STREET
		CITY:			SHERIDAN
		STATE:			WY
		ZIP:			82801
		BUSINESS PHONE:		(307) 673-9710

	MAIL ADDRESS:	
		STREET 1:		1 E. ALGER STREET
		CITY:			SHERIDAN
		STATE:			WY
		ZIP:			82801

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			WEBSTER STEVEN A
		CENTRAL INDEX KEY:			0001008023

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33457
		FILM NUMBER:		081037564

	BUSINESS ADDRESS:	
		STREET 1:		3 TEXAS STREET
		STREET 2:		SUITE 1375
		CITY:			SHREVEPORT
		STATE:			LA
		ZIP:			71101
		BUSINESS PHONE:		7133281000

	MAIL ADDRESS:	
		STREET 1:		1000 LOUISIANA SUITE 1500
		STREET 2:		SUITE 800
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77002
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>a4.xml
<DESCRIPTION>4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-08-25</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001362120</issuerCik>
        <issuerName>Pinnacle Gas Resources, Inc.</issuerName>
        <issuerTradingSymbol>PINN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001008023</rptOwnerCik>
            <rptOwnerName>WEBSTER STEVEN A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>14701 ST. MARY'S LANE, SUITE 800</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>HOUSTON</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>77079</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2008-08-25</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>12500</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>28136</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Grants of restricted common stock under the Amended and Restated Stock Incentive Plan.  The shares vest 100% on December 31, 2008.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Ronald T. Barnes, Attorney-in-fact</signatureName>
        <signatureDate>2008-08-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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