UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 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): May 15, 2012

SUBURBAN PROPANE PARTNERS, L.P.

(Exact Name of Registrant as Specified in Its Charter)

(973) 887-5300

(Registrant’s Telephone Number, Including Area Code)

N/A

(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 (see General Instruction A.2. below):

On May 14, 2012 (after such meeting was adjourned on its originally scheduled date of May 1 due to a lack of quorum), Suburban Propane Partners, L.P. (the “Partnership”) held its regular Tri-Annual Meeting (the “Meeting”) of its limited partners (“Unitholders”).

At the Meeting, the Unitholders re-elected to the Board of Supervisors, for a three-year term, all six nominees proposed by the Board:

At the Meeting, the Unitholders also approved the following proposals:

The approval of an advisory resolution approving executive compensation (commonly referred to as “Say-on-Pay”):

Adjournment of the Meeting, if necessary, to solicit additional proxies:

Unitholders were also asked to approve at the Meeting two sets of amendments to the limited partnership agreements of the Partnership and its operating subsidiary, Suburban Propane, L.P. (the “Existing Partnership Agreements”). Although both sets of amendments received the approval of over 80% of the common units actually voted at the Meeting, due to the relatively small percentage of eligible common units that were actually voted, neither set of amendments received the necessary approval of a majority of the Partnership’s outstanding common units. Therefore, neither set of amendments will be adopted by the Partnership:

The amendment of the Existing Partnership Agreements to potentially facilitate third party financing transactions:

The amendment of the Existing Partnership Agreements to provide Delaware courts as the exclusive forum for disputes regarding the interpretation of the partnership agreements:

Because the Partnership’s partnership agreement provides for Tri-Annual Meetings of the Unitholders (once every 3 years), no proposal regarding the frequency of Say-on-Pay resolutions was presented to the Unitholders at the Meeting. The Partnership will, for so long as required by applicable law, include a Say-on-Pay proposal at each Tri-Annual Meeting.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

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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: May 15, 2012

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EXHIBIT INDEX

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