<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:ns2="http://www.sec.gov/edgar/common">
    <headerData>
        <submissionType>144</submissionType>
        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001953262</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0001637207</issuerCik>
            <issuerName>PLANET FITNESS, INC.</issuerName>
            <secFileNumber>001-37534</secFileNumber>
            <issuerAddress>
                <ns2:street1>4 Liberty Lane West</ns2:street1>
                <ns2:city>Hampton</ns2:city>
                <ns2:stateOrCountry>NH</ns2:stateOrCountry>
                <ns2:zipCode>03842</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>(603) 750-0001</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>JENNIFER SIMMONS</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Officer</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>8th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>11453</noOfUnitsSold>
            <aggregateMarketValue>1101819.68</aggregateMarketValue>
            <noOfUnitsOutstanding>84592000</noOfUnitsOutstanding>
            <approxSaleDate>11/14/2024</approxSaleDate>
            <securitiesExchangeName>NYSE</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>04/09/2022</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>41</amountOfSecuritiesAcquired>
            <paymentDate>04/09/2022</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>03/15/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>178</amountOfSecuritiesAcquired>
            <paymentDate>03/15/2023</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>04/09/2021</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>42</amountOfSecuritiesAcquired>
            <paymentDate>04/09/2021</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>03/06/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>162</amountOfSecuritiesAcquired>
            <paymentDate>03/06/2023</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>04/05/2019</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>95</amountOfSecuritiesAcquired>
            <paymentDate>04/05/2019</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>03/19/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>246</amountOfSecuritiesAcquired>
            <paymentDate>03/19/2023</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>03/19/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>332</amountOfSecuritiesAcquired>
            <paymentDate>03/19/2024</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>03/19/2022</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>245</amountOfSecuritiesAcquired>
            <paymentDate>03/19/2022</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>04/09/2020</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>56</amountOfSecuritiesAcquired>
            <paymentDate>04/09/2020</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>04/09/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>42</amountOfSecuritiesAcquired>
            <paymentDate>04/09/2023</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>11/14/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Stock Option Exercise</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>8155</amountOfSecuritiesAcquired>
            <paymentDate>11/14/2024</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>04/02/2020</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>140</amountOfSecuritiesAcquired>
            <paymentDate>04/02/2020</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>04/02/2022</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>103</amountOfSecuritiesAcquired>
            <paymentDate>04/02/2022</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>03/06/2021</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>119</amountOfSecuritiesAcquired>
            <paymentDate>03/06/2021</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>03/15/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>1125</amountOfSecuritiesAcquired>
            <paymentDate>03/15/2024</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>03/06/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>162</amountOfSecuritiesAcquired>
            <paymentDate>03/06/2024</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>04/02/2021</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>103</amountOfSecuritiesAcquired>
            <paymentDate>04/02/2021</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>common</securitiesClassTitle>
            <acquiredDate>03/06/2022</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>107</amountOfSecuritiesAcquired>
            <paymentDate>03/06/2022</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>11/14/2024</noticeDate>
            <planAdoptionDates/>
            <signature>/s/ Jennifer Simmons</signature>
        </noticeSignature>
    </formData>
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[{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 13183}]
144
0001953262
XXXXXXXX
LIVE
0001637207
PLANET FITNESS, INC.
001-37534
4 Liberty Lane West
Hampton
NH
03842
(603) 750-0001
JENNIFER SIMMONS
Officer
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
11453
1101819.68
84592000
11/14/2024
NYSE
common
04/09/2022
Restricted Stock
Issuer
N
41
04/09/2022
Not Applicable
common
03/15/2023
Restricted Stock
Issuer
N
178
03/15/2023
Not Applicable
common
04/09/2021
Restricted Stock
Issuer
N
42
04/09/2021
Not Applicable
common
03/06/2023
Restricted Stock
Issuer
N
162
03/06/2023
Not Applicable
common
04/05/2019
Restricted Stock
Issuer
N
95
04/05/2019
Not Applicable
common
03/19/2023
Restricted Stock
Issuer
N
246
03/19/2023
Not Applicable
common
03/19/2024
Restricted Stock
Issuer
N
332
03/19/2024
Not Applicable
Common
03/19/2022
Restricted Stock
Issuer
N
245
03/19/2022
Not Applicable
common
04/09/2020
Restricted Stock
Issuer
N
56
04/09/2020
Not Applicable
common
04/09/2023
Restricted Stock
Issuer
N
42
04/09/2023
Not Applicable
Common
11/14/2024
Stock Option Exercise
Issuer
N
8155
11/14/2024
Cash
common
04/02/2020
Restricted Stock
Issuer
N
140
04/02/2020
Not Applicable
common
04/02/2022
Restricted Stock
Issuer
N
103
04/02/2022
Not Applicable
common
03/06/2021
Restricted Stock
Issuer
N
119
03/06/2021
Not Applicable
common
03/15/2024
Restricted Stock
Issuer
N
1125
03/15/2024
Not Applicable
common
03/06/2024
Restricted Stock
Issuer
N
162
03/06/2024
Not Applicable
common
04/02/2021
Restricted Stock
Issuer
N
103
04/02/2021
Not Applicable
common
03/06/2022
Restricted Stock
Issuer
N
107
03/06/2022
Not Applicable
Y
11/14/2024
/s/ Jennifer Simmons