HollyFrontier Corporation (NYSE: HFC) plans to announce results for its quarter ending June 30, 2013 on August 7, 2013, before the opening of trading on the NYSE. The company has scheduled a webcast conference on August 7, 2013 at 8:30 a.m. Eastern time to discuss financial results. This webcast may be accessed at: https://event.webcasts.com/starthere.jsp?ei=1018664. An audio archive of this webcast will be available using the above noted link through August 21, 2013. About HollyFrontier Corporation: HollyFrontier Corporation, headquartered in Dallas, Texas, is an independent petroleum refiner and marketer that produces high value light products such as gasoline, diesel fuel, jet fuel and other specialty products. HollyFrontier operates through its subsidiaries a 135,000 barrels per stream day ("bpsd") refinery located in El Dorado, Kansas, a 125,000 bpsd refinery in Tulsa, Oklahoma, a 100,000 bpsd refinery located in Artesia, New Mexico, a 52,000 bpsd refinery located in Cheyenne, Wyoming and a 31,000 bpsd refinery in Woods Cross, Utah. HollyFrontier markets its refined products principally in the Southwest U.S., the Rocky Mountains extending into the Pacific Northwest and in other neighboring Plains states. A subsidiary of HollyFrontier also currently owns a 39% interest (including a 2% general partner interest) in Holly Energy Partners, L.P. Information about the Company may be found on its website at www.hollyfrontier.com.