Costco Montana Gas Prices

Costco operates 5 fuel centers in Montana, spread across 5 cities. Across the state, regular gas averages $4.335, premium runs about $0.542 higher at $4.877, and diesel sits at $5.994. The lowest-priced regular pump is at Costco Helena in Helena at $4.299, while Kalispell in Kalispell sits about $0.060 higher. Across the state, regular pump prices have eased about $0.118 over the past month, from $4.453 a month ago. Premium has eased about $0.154 and diesel has climbed about $0.145 over the same period. Diesel is sold at 2 of the 5 Montana locations.

If your vehicle takes premium, the lowest in Montana is Costco Missoula in Missoula at $4.799. The cheapest diesel is at Costco Billings in Billings at $5.989. Pump prices shift from one warehouse to the next with local taxes, fuel-blend rules, and transport costs, but Costco fuel is members-only and usually runs below nearby branded stations — which is what keeps these pumps busy.