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

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2011-02-22</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001029800</issuerCik>
        <issuerName>URSTADT BIDDLE PROPERTIES INC</issuerName>
        <issuerTradingSymbol>UBA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001222959</rptOwnerCik>
            <rptOwnerName>CONWAY E VIRGIL</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>101 PARK AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>30TH FL</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10178</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2011-02-22</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>1</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>4000</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>88321</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">On February 22, 2011, the Reporting Person completed an equity swap (the &quot;Equity Swap&quot;) of 4,000 shares of Common Stock of the Issuer for 4,000 shares of Class A Common Stock of the Issuer with Willing L. Biddle, an executive officer and director of the Issuer, by acquiring 4,000 shares of Class A Common Stock pursuant to the Equity Swap.</footnote>
        <footnote id="F2">This figure includes 4,500 restricted shares of Class A Common Stock issued pursuant to the Issuer's Amended and Restated Restricted Stock Award Plan.</footnote>
        <footnote id="F3">The Reporting Person is the direct beneficial owner of 28,321 shares of Class A Common Stock, which includes the 4,500 restricted shares referenced in Footnote (2).  Additionally, he is the indirect beneficial owner of 60,000 shares of Class A Common Stock, of which 50,000 shares are held in the name of the Reporting Person's IRA Rollover Trust and 10,000 shares are owned by The Conway Foundation (the &quot;Foundation&quot;), of which the Reporting Person and his wife, Elaine Conway, are officers and directors.  Mr. Conway disclaims beneficial ownership of any shares held by the Foundation.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>E. Virgil Conway by Thomas D. Myers as Attorney-in-Fact</signatureName>
        <signatureDate>2011-02-23</signatureDate>
    </ownerSignature>
</ownershipDocument>
