Montana Gas Prices

What drivers in Montana are paying this week

Montana does not have a published weekly statewide average, so the reference number above is the Rocky Mountain (PADD 4) average of $4.458. That regional benchmark fell $0.010 week over week and is $0.189 above the national average of $4.269. Stations in Montana typically trade within roughly 20 to 40 cents of the regional figure, depending on distance from the nearest terminal and local taxes.

Montana has low fuel taxes but long delivery distances. Billings is supplied by the state’s only major refinery, while western Montana depends on product trucked from Idaho and Washington.

Why Montana gas prices land where they do

• Low state fuel tax.
• One refinery in Billings supplies most of eastern Montana.
• Western Montana prices track the more expensive Rocky Mountain and West Coast markets.

These are structural factors, not daily noise. They explain why Montana tends to sit in the same part of the national price range week after week, even when the national average moves. For the general mechanics behind these forces, see our guide on how gas prices are set.

How Montana compares

Montana has no bordering state with a published weekly average, so the most useful comparison is the national average of $4.269 and the Rocky Mountain (PADD 4) benchmark of $4.458. The state currently sits $0.189 higher than the national figure.

Ways to spend less on gas in Montana

1. Membership warehouses such as Costco, Sam’s Club, and BJ’s usually price 10 to 30 cents below nearby branded stations.
2. Stations a few miles off the interstate are often cheaper than the first exit, because they pay less for land and rely on local traffic.
3. Apps that show station-level prices are worth using for the last mile — our numbers give you the regional baseline, they give you the address.
4. Keeping tires at the recommended pressure and removing roof racks can recover 3 to 6 percent of fuel economy, which is worth 10 to 20 cents a gallon at current prices.

Want a number instead of a rule of thumb? The commute cost calculator turns your own miles and MPG into a weekly and annual fuel bill, using the current Montana price as the default.

How we source Montana prices

Every figure on this page comes from the U.S. Energy Information Administration's weekly retail gasoline survey, which reports average retail prices in dollars per gallon including taxes. We rebuild the page every week after the survey is released, so the date on the price panel always matches the data behind it. We do not estimate missing state numbers; where the EIA does not publish a statewide series, we label the regional benchmark instead. Full details are in our methodology and data sources pages.

The bottom line for Montana drivers

At the regional benchmark of $4.458 per gallon, a 12-gallon fill-up in Montana costs about $53.50. Over a 15,000-mile year at 28 MPG, that implies roughly $2388 in fuel, before any local station discounts.