<?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>0001879519</rptOwnerCik>
            <rptOwnerName>Wolszczak Jay 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>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>General Counsel and Secretary</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>2028-07-18</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>177570</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>12.68</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2029-04-24</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>69055</value>
                    <footnoteId id="F2"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Represents stock options awarded on July 18, 2018, pursuant to the Issuer's 2017 Omnibus Equity Incentive Plan (the &quot;Plan&quot;). Unvested stock options vest in installments as follows: (a) 21,308 options on each of July 18, 2022 and the first anniversary thereof; and (b) 23,676 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>
        <footnote id="F2">Represents stock options awarded on April 24, 2019, pursuant to the Plan. Unvested stock options vest in installments as follows: (a) 8,286 options on April 24, 2022, and 8,287 options on each of the first two anniversaries thereof; and (b) 9,207 options on each of the first two anniversaries of the closing of the IPO, and 9,208 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</signatureName>
        <signatureDate>2021-10-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
