Costco Montana Gas Prices

Costco operates 5 fuel centers in Montana, spread across 5 cities. Across the state, regular gas averages $4.243, premium runs about $0.580 higher at $4.823, and diesel sits at $5.299. The lowest-priced regular pump is at Costco Missoula in Missoula at $4.149, while Helena in Helena sits about $0.150 higher. Across the state, regular pump prices have climbed about $0.090 over the past month, from $4.153 a month ago. Premium has climbed about $0.068 and diesel has climbed about $0.325 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 Billings in Billings at $4.729. The cheapest diesel is at Costco Billings in Billings at $5.249. 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.