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

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2007-11-28</periodOfReport>

    <issuer>
        <issuerCik>0000737758</issuerCik>
        <issuerName>TORO CO</issuerName>
        <issuerTradingSymbol>TTC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001382375</rptOwnerCik>
            <rptOwnerName>Redetzke Darren L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>8111 LYNDALE AVENUE SOUTH</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BLOOMINGTON</rptOwnerCity>
            <rptOwnerState>MN</rptOwnerState>
            <rptOwnerZipCode>55420-1196</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <officerTitle></officerTitle>
            <otherText>General Manager, Intl</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>6563.6119</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>The Toro Company Investment, Savings &amp; ESOP</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>54.93</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2007-11-28</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>3900</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2008-11-28</value>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2017-11-28</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>3900</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3900</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Includes the following Shares of Common Stock acquired by the reporting person under the dividend reinvestment feature of The Toro Company Investment, Savings &amp; ESOP: 15.6879 Shares of Common Stock acquired by the reporting person on January 12, 2007, 15.169 Shares of Common Stock acquired by the reporting person on April 12, 2007, 12.7356 Shares of Common Stock acquired by the reporting person on July 12, 2007 and 13.8887 Shares of Common Stock acquired by the reporting person on October 17, 2007.  Also includes 93.9858 Shares of Common Stock acquired by the reporting person through contributions to The Toro Company Investment, Savings &amp; ESOP since the date of his last report.</footnote>
        <footnote id="F2">The option vests in three equal annual installments commencing on the first anniversary of the date of grant.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Stacy L. Bogart, Atty-In-Fact</signatureName>
        <signatureDate>2007-11-30</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0202
4
2007-11-28
0000737758
TORO CO
TTC
0001382375
Redetzke Darren L
8111 LYNDALE AVENUE SOUTH
BLOOMINGTON
MN
55420-1196
0
0
0
1
General Manager, Intl
Common Stock
6563.6119
I
The Toro Company Investment, Savings & ESOP
Stock Option
54.93
2007-11-28
4
A
0
3900
0
A
2008-11-28
2017-11-28
Common Stock
3900
3900
D
Includes the following Shares of Common Stock acquired by the reporting person under the dividend reinvestment feature of The Toro Company Investment, Savings & ESOP: 15.6879 Shares of Common Stock acquired by the reporting person on January 12, 2007, 15.169 Shares of Common Stock acquired by the reporting person on April 12, 2007, 12.7356 Shares of Common Stock acquired by the reporting person on July 12, 2007 and 13.8887 Shares of Common Stock acquired by the reporting person on October 17, 2007.  Also includes 93.9858 Shares of Common Stock acquired by the reporting person through contributions to The Toro Company Investment, Savings & ESOP since the date of his last report.
The option vests in three equal annual installments commencing on the first anniversary of the date of grant.
Stacy L. Bogart, Atty-In-Fact
2007-11-30