<?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>0001333488</rptOwnerCik>
            <rptOwnerName>Bradley Julie MB</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>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>13.52</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2030-01-29</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>61655</value>
                    <footnoteId id="F1"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Represents stock options awarded on January 29, 2020, pursuant to the Issuer's 2017 Omnibus Equity Incentive Plan. Unvested stock options vest in installments as follows: (a) 7,398 options on each of January 29, 2022 and January 29, 2023, and 7,399 options on each of January 29, 2024 and January 29, 2025; and (b) 8,220 options on  the first anniversary of the closing of the Issuer's initial public offering (the &quot;IPO&quot;), and 8,221 options on each of the second anniversary of the closing of the IPO 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>
