Frontier Oil

Frontier Oil Corporation is an independent oil refining and marketing company with complex refineries located in Wyoming and Kansas. Frontier's primary products of gasoline, diesel and are marketed in the Rocky Mountain and Plains States. Frontier Oil Corporation is headquartered in Houston, Texas. The subsidiary company Frontier Refining & Marketing, Inc. is located in Denver, Colorado. The company has a 52,000 bpd refinery in Cheyenne, Wyoming and a 110,000 bpd refinery in El Dorado, Kansas.