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

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2022-01-01</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001821806</issuerCik>
        <issuerName>Leslie's, Inc.</issuerName>
        <issuerTradingSymbol>LESL</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001902863</rptOwnerCik>
            <rptOwnerName>LaBode Moyo</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2005 EAST INDIAN SCHOOL ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>PHOENIX</rptOwnerCity>
            <rptOwnerState>AZ</rptOwnerState>
            <rptOwnerZipCode>85016</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Merchandising Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Restricted Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0.00</value>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>65000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Options to purchase shares</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>26.11</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <value>2031-05-12</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>183333</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Options to purchase shares</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>26.11</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2021-12-16</value>
            </exerciseDate>
            <expirationDate>
                <value>2031-05-12</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>45833</value>
                    <footnoteId id="F4"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Represents a grant of RSUs, which will vest in four (4) equal installments on May 12, 2022, May 12, 2023, May 12, 2024, and May 12, 2025, subject to Mr. LaBode's continuous employment or service with the Issuer or an affiliate until the applicable vesting date.</footnote>
        <footnote id="F2">Each RSU represents the contingent right to receive, upon vesting of the RSU, one share of the Issuer's Common Stock.</footnote>
        <footnote id="F3">Represents a grant of options to purchase shares (&quot;Options&quot;) which will vest in four equal installments on May 12, 2022, May 12, 2023, May 12, 2024, and May 12, 2025, subject to Mr. LaBode's continuous employment or service with the Issuer or an affiliate until the applicable vesting date.</footnote>
        <footnote id="F4">On May 12, 2021, Mr. LaBode was granted Options to purchase 91,667 shares of common stock. The Options vest in two equal annual installments based on the Issuer's satisfaction of certain performance criteria for each of the fiscal years ending October 2, 2021 and October 1, 2022. The performance criteria for 2021 were met, resulting in vesting of the Options as to 45,833 shares.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Brad A. Gazaway, as Attorney-in-Fact for Moyo LaBode</signatureName>
        <signatureDate>2022-01-11</signatureDate>
    </ownerSignature>
</ownershipDocument>
