Frontier Oil Corporation (NYSE:FTO) plans to announce results for the quarter ended March 31, 2008 on Wednesday, May 7, 2008. Management has scheduled a conference call for the morning of May 7th at 11:00 a.m. (eastern time) to discuss the financial results and business outlook.

To access the call, which is open to the public, please dial (877) 852-6561 several minutes prior to the call. For those individuals outside the United States, please call (719) 325-4771. A recorded replay of the call may be heard through May 21, 2008 by dialing (888) 203-1112 (international callers (719) 457-0820) and entering the code 9792242. In addition, the real-time conference call and a recorded replay will be available via webcast, go to www.frontieroil.com and register from the Investor Relations page of the site.

Frontier operates a 120,000 barrel-per-day refinery located in El Dorado, Kansas, and a 52,000 barrel-per-day refinery located in Cheyenne, Wyoming, and markets its refined products principally along the eastern slope of the Rocky Mountains and in other neighboring plains states.

Frontier Oil Corporation, Houston
Doug Aron, 713-688-9600 x145