<?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>0001310215</rptOwnerCik>
            <rptOwnerName>Alvarez Ralph</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>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>98650</value>
                    <footnoteId id="F1"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>13.52</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2029-09-27</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>98650</value>
                    <footnoteId id="F2"/>
                </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 (the &quot;Plan&quot;). Unvested stock options vest in installments as follows: (a) 11,838 options on August 21, 2022; and (b) 13,153 options on each of the first two anniversaries of the closing of the Issuer's initial public offering (the &quot;IPO&quot;), and 13,154 options on the 273rd day following the second anniversary of the closing of the IPO, subject to earlier forfeiture or acceleration.</footnote>
        <footnote id="F2">Represents stock options awarded on September 27, 2019, pursuant to the Plan. Unvested stock options vest in installments as follows: (a) 11,838 options on each of September 27, 2022 and the first two anniversaries thereof; and (b) 13,153 options on each of the first two anniversaries of the closing of the IPO, and 13,154 options 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>
