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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2017-05-02</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0000008146</issuerCik>
        <issuerName>AstroNova, Inc.</issuerName>
        <issuerTradingSymbol>ALOT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001672244</rptOwnerCik>
            <rptOwnerName>Albert W. Ondis Declaration of Trust</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>515 BEACH ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>FAIRFIELD</rptOwnerCity>
            <rptOwnerState>CT</rptOwnerState>
            <rptOwnerZipCode>06824</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001527099</rptOwnerCik>
            <rptOwnerName>Ondis Albert W. III</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1></rptOwnerStreet1>
            <rptOwnerStreet2>515 BEACH ROAD</rptOwnerStreet2>
            <rptOwnerCity>FAIRFIELD</rptOwnerCity>
            <rptOwnerState>CT</rptOwnerState>
            <rptOwnerZipCode>06824</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2017-05-02</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>826305</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>13.60</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>204530</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Trustee</value>
                    <footnoteId id="F5"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">These securities were owned by the Albert W. Ondis Declaration of Trust (the &quot;Trust&quot;), of which Albert W. Ondis III is the sole trustee.  Each of the Trust and Albert W. Ondis III has a beneficial interest in such shares and for purposes of Schedule 13(d) of the Exchange Act, the Trust is a member of a &quot;group&quot; with Albert W. Ondis III.</footnote>
        <footnote id="F2">Following this transaction, the Trust is the beneficial owner of 36,000 shares of common stock the Issuer and Albert W. Ondis III is the beneficial owner of 168,530 shares of common stock of the Issuer (includes the 36,000 of the shares of common stock of the Issuer held by the Trust, of which Albert W. Ondis III is the sole trustee; 1,658 shares of common stock of the Issuer held in trust for a child of Albert W. Ondis III; and 130,872 shares of common stock of the Issuer owned personally by Albert W. Ondis III).</footnote>
        <footnote id="F3">The Trust is the Direct owner of 36,000 shares of common stock the Issuer.</footnote>
        <footnote id="F4">Albert W. Ondis III is the Indirect owner of 37,658 shares of common stock of the Issuer (includes the 36,000 of the shares of common stock of the Issuer held by the Trust, of which Albert W. Ondis III is the sole trustee, and 1,658 shares of common stock of the Issuer held in trust for a child of Albert W. Ondis III). Albert W. Ondis III is the Direct owner of 130,872 shares of common stock of the Issuer.</footnote>
        <footnote id="F5">By Albert W. Ondis III as trustee for Albert W. Ondis Declaration of Trust.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Margaret D. Farrell (Attorney-in-fact for Albert W. Ondis, trustee)</signatureName>
        <signatureDate>2017-05-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
