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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2019-07-09</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001616533</issuerCik>
        <issuerName>SMART Global Holdings, Inc.</issuerName>
        <issuerTradingSymbol>SGH</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001008036</rptOwnerCik>
            <rptOwnerName>SHAH AJAY</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O SILVER LAKE,</rptOwnerStreet1>
            <rptOwnerStreet2>2775 SAND HILL ROAD, SUITE 100</rptOwnerStreet2>
            <rptOwnerCity>MENLO PARK</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94025</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President and CEO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Ordinary Shares</value>
            </securityTitle>
            <transactionDate>
                <value>2019-07-09</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>176612</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>313794</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Ordinary Shares</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>6138094</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Held through Silver Lake Partners III Cayman (AIV III), L.P.</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F5"/>
                    <footnoteId id="F10"/>
                    <footnoteId id="F11"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Ordinary Shares</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>33077</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Held through Silver Lake Technology Investors III Cayman, L.P</value>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                    <footnoteId id="F10"/>
                    <footnoteId id="F11"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Ordinary Shares</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3048465</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Held through Silver Lake Sumeru Fund Cayman, L.P.</value>
                    <footnoteId id="F6"/>
                    <footnoteId id="F8"/>
                    <footnoteId id="F10"/>
                    <footnoteId id="F11"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Ordinary Shares</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>37119</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Held through Silver Lake Technology Investors Sumeru Cayman, L.P.</value>
                    <footnoteId id="F7"/>
                    <footnoteId id="F8"/>
                    <footnoteId id="F10"/>
                    <footnoteId id="F11"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Ordinary Shares</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>188950</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F9"/>
                    <footnoteId id="F11"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">In connection with the acquisition by SMART Global Holdings, Inc. (the &quot;Issuer&quot;) of Inforce Computing, Inc. (&quot;Inforce Computing&quot;) on July 9, 2019, pursuant to an Agreement and Plan of Merger, dated July 9, 2019 (the &quot;Merger Agreement&quot;), Mr. Shah became entitled to receive 176,612 Ordinary Shares of the Issuer in respect of his approximate 28% ownership interest in Inforce Computing, 150,074 Ordinary Shares of which were issued to Mr. Shah at the closing of the acquisition and an additional 26,538 Ordinary Shares (&quot;Holdback Shares&quot;) of which may be issued to Mr. Shah on the date that is one year following the closing of the acquisition, which Holdback Shares were retained by the Issuer as security for post-closing purchase price adjustments and the indemnification obligations of certain shareholders of Inforce Computing under the Merger Agreement.</footnote>
        <footnote id="F2">These securities are held by Mr. Shah directly.</footnote>
        <footnote id="F3">These securities are directly held by Silver Lake Partners III Cayman (AIV III), L.P. (&quot;SLP III Cayman&quot;).</footnote>
        <footnote id="F4">These securities are directly held by Silver Lake Technology Investors III Cayman, L.P. (&quot;SLTI III Cayman&quot;).</footnote>
        <footnote id="F5">Silver Lake Technology Associates III Cayman, L.P. (&quot;SLTA III Cayman&quot;) is the general partner of SLP III Cayman and SLTI III Cayman. Silver Lake (Offshore) AIV GP III, Ltd. is the general partner of SLTA III Cayman.</footnote>
        <footnote id="F6">These securities are directly held by Silver Lake Sumeru Fund Cayman, L.P. (&quot;SLS Cayman&quot;).</footnote>
        <footnote id="F7">These securities are directly held by Silver Lake Technology Investors Sumeru Cayman, L.P. (&quot;SLTI Sumeru Cayman&quot;).</footnote>
        <footnote id="F8">Silver Lake Technology Associates Sumeru Cayman, L.P. (&quot;SLTA Sumeru Cayman&quot;) is the general partner of SLS Cayman and SLTI Sumeru Cayman. SLTA Sumeru (GP) Cayman, L.P. (&quot;SLTA Sumeru GP Cayman&quot;) is the general partner of SLTA Sumeru Cayman, and the general partner of SLTA Sumeru GP Cayman is Silver Lake Sumeru (Offshore) AIV GP, Ltd. (&quot;SL Sumeru Offshore Ltd.&quot;).</footnote>
        <footnote id="F9">These securities are held through trusts for the benefit of Mr. Shah and his family.</footnote>
        <footnote id="F10">Mr. Shah serves as Chairman of the Board, President and Chief Executive Officer of the Issuer, and as a director of SL Sumeru Offshore Ltd. and/or Silver Lake (Offshore) AIV GP III, Ltd. and may be deemed to beneficially own any securities beneficially owned by SL Sumeru Offshore Ltd. and/or Silver Lake (Offshore) AIV GP III, Ltd. but disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.</footnote>
        <footnote id="F11">This filing shall not be deemed an admission that for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the &quot;Exchange Act&quot;) or otherwise, that Mr. Shah is the beneficial owner of any equity securities in excess of his pecuniary interest, and Mr. Shah disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein, if any.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>AJAY SHAH By: /s/ Ajay Shah</signatureName>
        <signatureDate>2019-07-11</signatureDate>
    </ownerSignature>
</ownershipDocument>
