UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of

the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): February 19, 2013

StoneMor Partners L.P.

(Exact name of registrant as specified in its charter)

311 Veterans Highway, Suite B, Levittown, PA 19056

(Address of principal executive offices) (Zip Code)

Registrant’s telephone number, including area code (215) 826-2800

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

On February 19, 2013, StoneMor Partners L.P. (the “Partnership”) entered into the First Amendment (the “First Amendment”) to the Third Amended and Restated Credit Agreement (the “Credit Agreement”) with StoneMor Operating LLC as a Borrower (the “Operating Company”), each of the subsidiaries of the Operating Company as additional Borrowers, StoneMor GP LLC, the general partner of the Partnership, the Lenders identified therein, and Bank of America, N.A., as Administrative Agent, Swing Line Lender and L/C Issuer.

The First Amendment provides for the increase in the maximum aggregate principal amount of the revolving credit facility under the Credit Agreement from $130.0 million to $140.0 million. The First Amendment also includes various representations, warranties and other provisions customary for a transaction of this nature. The foregoing summary of the First Amendment is not intended to be complete and is qualified in its entirety by reference to the First Amendment, a copy of which is attached hereto as Exhibit 10.1 and is incorporated by reference herein. Capitalized terms which are not defined in this Current Report on Form 8-K shall have the meanings assigned to such terms in the First Amendment or the Credit Agreement, as applicable.

The Lenders and their respective affiliates act as lenders under the First Amendment and the Credit Agreement and engaged in, and may in the future engage in, investment banking and other commercial dealings with the Partnership and its affiliates for which they received, and will receive, the payment of their customary fees and expenses.

On February 19, 2013, the Partnership entered into the First Amendment. The terms of the First Amendment are described in Item 1.01 above, which description is incorporated in its entirety by reference herein.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: February 22, 2013

EXHIBIT INDEX