Gas Prices in Montana Today
Track today's average gas price in Montana, compare it to the national average, and estimate your fuel costs with a free calculator. Prices come from the EIA's weekly retail gasoline survey.
Average Gas Price for Montana (EIA Rocky Mountain region)
$4.46/gal
19¢ above the national average ($4.27/gal)
EIA weekly price for regular gasoline, week of October 26, 2026.
Estimate Your Gas Cost in Montana
The calculator below is pre-filled with this Rocky Mountain regional average. Enter your trip distance and MPG to get an instant fuel cost estimate.
Rocky Mountain Region Gas Price History
The EIA does not publish weekly prices for Montana, so this chart shows the Rocky Mountain regional average for regular gasoline, the same series behind the Montana price above. The region also covers Idaho, Utah, and Wyoming, so the line describes the region as a whole, not Montana alone. The latest week is $1.49 a gallon higher than a year earlier.
Latest week
$4.46
October 26, 2026
A year earlier
$2.97
October 27, 2025
Highest week shown
$4.59
May 18, 2026
Lowest week shown
$2.40
January 5, 2026
Source: EIA weekly retail prices for regular gasoline, Rocky Mountain regional average, November 4, 2024 to October 26, 2026. Prices in dollars per gallon.
About Gas Prices in Montana
The U.S. Energy Information Administration (EIA) surveys fuel retailers weekly but doesn't publish a separate price for Montana, so the price shown is the EIA's Rocky Mountain regional average for regular unleaded gasoline. Prices at individual stations in Montana may be higher or lower depending on location, brand, and local competition.
Several factors influence Montana's gas price: state fuel taxes, the distance from major refineries, pipeline and distribution infrastructure, and the required seasonal fuel blend. Use the calculator above to see exactly how today's Montana price affects your commute, road trip, or monthly driving budget.
Montana Fuel Taxes: ≈33¢/gal
Montana has a state gas tax close to the national average. Montana's state gas tax is about 33 cents per gallon, close to the roughly 33.5-cent national average. The rate was phased up in steps between 2017 and 2023 under a state road-and-bridge funding law after decades of little change.
Tax figures are approximate state-level taxes and fees per gallon of regular gasoline and exclude the 18.4¢/gal federal excise tax. Rates change, so verify current rates with the state's revenue or transportation department.
How Montana Gets Its Gasoline
Montana is a refining state. Four refineries operate here — three around Billings (Phillips 66, ExxonMobil, and CHS's plant in nearby Laurel) plus Calumet's refinery in Great Falls — processing crude from the Bakken region and Canada. That is a large amount of refining capacity for a state of just over a million people, and the Billings complex also supplies parts of Wyoming, Idaho, and eastern Washington. Western Montana draws its fuel from Billings through the Yellowstone Pipeline, which runs west to the Missoula area.
Where Gas Is Cheapest and Most Expensive in Montana
Billings, sitting next to the refineries, consistently has the lowest gas prices in Montana. Prices climb heading west: Missoula, Kalispell, and the Flathead sit at the end of the pipeline and pay more, and communities near Glacier and Yellowstone run higher still during the summer tourist season.