<?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>0001881595</rptOwnerCik>
            <rptOwnerName>Price Lisa Marguerite</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>12.68</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2030-09-08</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>65767</value>
                    <footnoteId id="F1"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Represents stock options awarded on September 8, 2020, pursuant to the Issuer's 2017 Omnibus Equity Incentive Plan. Unvested stock options vest in installments as follows: (a) 7,892 options on each of September 8, 2022 and the first three anniversaries thereof; and (b) 8,768 options on the first anniversary of the closing of the Issuer's initial public offering (the &quot;IPO&quot;), and 8,769 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>
