<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2011-03-31</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001492298</issuerCik>
        <issuerName>Sabra Health Care REIT, Inc.</issuerName>
        <issuerTradingSymbol>SBRA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001472457</rptOwnerCik>
            <rptOwnerName>Barbarosh Craig A.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O SABRA HEALTH CARE REIT, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>18500 VON KARMAN AVENUE, SUITE 550</rptOwnerStreet2>
            <rptOwnerCity>IRVINE</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92612</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>2011-03-31</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>744</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>4208</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents stock units received by the reporting person in lieu of quarterly director fees pursuant to an election under the Issuer's Non-Employee Directors Stock-For-Fees Program.  The units are fully vested and are payable in an equivalent number of shares of the Issuer's Common Stock on or within sixty (60) days following the earlier of the reporting person's separation from service or March 31, 2016.</footnote>
        <footnote id="F2">Consists of 2,426 unvested restricted stock units and 1,782 stock units that have vested but the payment of which has been deferred, including the 744 stock units reported herein.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/Harold W. Andrews, Jr. as Attorney-in-Fact</signatureName>
        <signatureDate>2011-04-15</signatureDate>
    </ownerSignature>
</ownershipDocument>
