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

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2021-10-01</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001789940</issuerCik>
        <issuerName>First Watch Restaurant Group, Inc.</issuerName>
        <issuerTradingSymbol>FWRG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001879565</rptOwnerCik>
            <rptOwnerName>Tomasso Christopher Anthony</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O FIRST WATCH RESTAURANT GROUP, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>8725 PENDERY PLACE, SUITE 201</rptOwnerStreet2>
            <rptOwnerCity>BRADENTON</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>34201</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President and CEO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>8.45</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2027-08-21</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1035825</value>
                    <footnoteId id="F1"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Represents stock options awarded on August 21, 2017, pursuant to the Issuer's 2017 Omnibus Equity Incentive Plan. Unvested stock options vest in installments as follows: (a) 124,299 options on August 21, 2022; and (b) 138,110 options on each of the first two anniversaries of the closing of the Issuer's initial public offering (the &quot;IPO&quot;) and on the 273rd day following the second anniversary of the closing of the IPO, subject to earlier forfeiture or acceleration.</footnote>
    </footnotes>

    <remarks>Exhibit 24 - Power of Attorney, incorporated herein by reference</remarks>

    <ownerSignature>
        <signatureName>By: /s/ Jay Wolszczak, as attorney-in-fact</signatureName>
        <signatureDate>2021-10-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
