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 9, 2012 (February 3, 2012)

(Exact name of registrant as specified in its charter)

(Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (214) 871-3555

(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):

Item 1.01 Entry into a Material Definitive Agreement.

On February 3, 2012, Holly Energy Partners – Operating, L.P. (the “Borrower”), a wholly-owned subsidiary of Holly Energy Partners, L.P. (the “Partnership”), entered into an Agreement and Amendment No. 1 to Second Amended and Restated Credit Agreement (the “Amendment”) with certain of its subsidiaries acting as guarantors, Wells Fargo Bank, N.A., as administrative agent (the “Administrative Agent”), an issuing bank and a lender, and certain other lenders party thereto, which amends certain terms of the Second Amended and Restated Credit Agreement, dated February 14, 2011 (the “Credit Agreement”), among the Borrower, the Administrative Agent, Union Bank, N.A., as syndication agent, BBVA Compass Bank and U.S. Bank N.A., as co-documentation agents, and certain other lenders. Principally, the Amendment increases the maximum amount of the revolving credit facility from $275,000,000 to $375,000,000 (which amount can, upon Borrower’s request and upon the satisfaction of certain conditions, be increased by an additional $200,000,000). The Credit Agreement is available to fund capital expenditures, investments, acquisitions, distribution payments and working capital, to repay or repurchase our 6.25% senior notes maturing March 1, 2015 and for general partnership purposes.

The foregoing description of the Amendment does not purport to be complete and is qualified in its entirety by reference to the full text of the Amendment, a copy of which is attached hereto as Exhibit 10.1 and is incorporated herein by reference.

Item 2.03 Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

The information set forth in Item 1.01 is incorporated into this Item 2.03 by reference.

Item 9.01 Financial Statements and Exhibits.

2

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 thereunto duly authorized.

Date: February 9, 2012

EXHIBIT INDEX