September 15, 2008

Frontier Oil Corporation Houston Office Closed Due to Hurricane Ike

Frontier Oil Corporation (NYSE:FTO) announced today that its corporate headquarters in Houston, Texas are closed until further notice due to a loss of power suffered during Hurricane Ike. Frontier's corporate function will continue from different locations. To reach a member of the Houston office, please contact Janet Hunter in Frontier's Denver office at 303-714-0134.

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 neighboring plains states. Information about Frontier may be found on its web site at