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

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-12-03</periodOfReport>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001167144</rptOwnerCik>
            <rptOwnerName>WOLFE STEPHEN P</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>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>VP, Finance &amp; CFO</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock Units</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>24102.714</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Matching Units</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>12051.331</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Performance Share Units</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>204254.828</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>50790</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By trust for reporting person</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>27463.975</value>
                    <footnoteId id="F4"/>
                </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>28.62</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2008-12-03</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>24200</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F5"/>
            </exerciseDate>
            <expirationDate>
                <value>2018-12-03</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>24200</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>24200</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F2">Includes the following Matching Units acquired by the reporting person under the dividend reinvestment feature of The Toro Company Deferred Compensation Plan for Officers:  37.66 Matching Units acquired on January 11, 2008, 43.168 Matching Units acquired on April 11, 2008, 57.962 Matching Units acquired on July 11, 2008 and 55.774 Matching Units acquired on October 17, 2008.  Also includes an account adjustment (rounding) of 2.1223 Matching Units.</footnote>
        <footnote id="F4">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:  82.5762 shares acquired on January 11, 2008, 98.776 shares acquired on April 11, 2008, 131.762 shares acquired on July 11, 2008 and 127.834 shares acquired on October 17, 2008.  Also includes 68.091 shares of common stock acquired by the reporting person through issuer matching contributions to The Toro Company Investment, Savings &amp; ESOP.</footnote>
        <footnote id="F1">Includes the following Common Stock Units acquired by the reporting person under the dividend reinvestment feature of The Toro Company Deferred Compensation Plan for Officers: 75.321 Common Stock Units acquired on January 11, 2008, 86.338 Common Stock Units acquired on April 11, 2008, 115.926 Common Stock Units acquired on July 11, 2008 and 111.549 Common Stock Units acquired on October 11, 2008.  Also includes an account adjustment (rounding) of .2454 Common Stock Units.</footnote>
        <footnote id="F5">The option vests in three equal annual installments commencing on the first anniversary of the date of grant.</footnote>
        <footnote id="F3">Includes the following Performance Share Units acquired by the reporting person under the dividend reinvestment feature of The Toro Company Deferred Compensation Plan for Officers:  638.298 Performance Share Units acquired on January 11, 2008, 731.656 Performance Share Units acquired on April 11, 2008, 982.393 Performance Share Units acquired on July 11, 2008, and 945.303 Performance Share Units acquired on October 17, 2008.  Also includes an account adjustment (rounding) of 2.0751 Performance Share Units.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Stacy L. Bogart, Atty-In-Fact</signatureName>
        <signatureDate>2008-12-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
[{"type": "4", "sequence": "1", "filename": "doc.xml", "description": "PRIMARY DOCUMENT", "secsgml_size_bytes": 9347}]
X0303
4
2008-12-03
0000737758
TORO CO
TTC
0001167144
WOLFE STEPHEN P
8111 LYNDALE AVENUE SOUTH
BLOOMINGTON
MN
55420-1196
0
1
0
0
VP, Finance & CFO
Common Stock Units
24102.714
D
Matching Units
12051.331
D
Performance Share Units
204254.828
D
Common Stock
50790
I
By trust for reporting person
Common Stock
27463.975
I
The Toro Company Investment, Savings & ESOP
Stock Option
28.62
2008-12-03
4
A
0
24200
0
A
2018-12-03
Common Stock
24200
24200
D
Includes the following Matching Units acquired by the reporting person under the dividend reinvestment feature of The Toro Company Deferred Compensation Plan for Officers:  37.66 Matching Units acquired on January 11, 2008, 43.168 Matching Units acquired on April 11, 2008, 57.962 Matching Units acquired on July 11, 2008 and 55.774 Matching Units acquired on October 17, 2008.  Also includes an account adjustment (rounding) of 2.1223 Matching Units.
Includes the following shares of common stock acquired by the reporting person under the dividend reinvestment feature of The Toro Company Investment, Savings & ESOP:  82.5762 shares acquired on January 11, 2008, 98.776 shares acquired on April 11, 2008, 131.762 shares acquired on July 11, 2008 and 127.834 shares acquired on October 17, 2008.  Also includes 68.091 shares of common stock acquired by the reporting person through issuer matching contributions to The Toro Company Investment, Savings & ESOP.
Includes the following Common Stock Units acquired by the reporting person under the dividend reinvestment feature of The Toro Company Deferred Compensation Plan for Officers: 75.321 Common Stock Units acquired on January 11, 2008, 86.338 Common Stock Units acquired on April 11, 2008, 115.926 Common Stock Units acquired on July 11, 2008 and 111.549 Common Stock Units acquired on October 11, 2008.  Also includes an account adjustment (rounding) of .2454 Common Stock Units.
The option vests in three equal annual installments commencing on the first anniversary of the date of grant.
Includes the following Performance Share Units acquired by the reporting person under the dividend reinvestment feature of The Toro Company Deferred Compensation Plan for Officers:  638.298 Performance Share Units acquired on January 11, 2008, 731.656 Performance Share Units acquired on April 11, 2008, 982.393 Performance Share Units acquired on July 11, 2008, and 945.303 Performance Share Units acquired on October 17, 2008.  Also includes an account adjustment (rounding) of 2.0751 Performance Share Units.
Stacy L. Bogart, Atty-In-Fact
2008-12-05