Gas prices in Montana today
Regular gas in Montana averages $4.41 a gallon, 3% more than the U.S. average of $4.27. That makes Montana in the middle: rank 35 of 51 (1 = cheapest).
| Grade | Montana | U.S. average | 15-gallon fill-up |
|---|---|---|---|
| Regular | $4.41 | $4.27 | $66 |
| Mid-grade | $4.72 | $4.78 | $71 |
| Premium | $5.08 | $5.17 | $76 |
| Diesel | $6.17 | $6.35 | $93 |
Source: AAA, Montana average gas prices and AAA State Gas Price Averages, as of Oct 24, 2026. Fill-up = price × 15 gallons (our calculation). For metro-area prices, see AAA's Montana page.
Taxes in the price: 33.8¢ a gallon in Montana state taxes and fees plus the 18.4¢ federal tax, 52.1¢ in all, about 12% of today's price (Tax Foundation, July 2026; our calculation). Gas tax in Montana.
What driving costs in Montana
At $4.41 a gallon, a car that gets 27.2 mpg (the EPA's average for new vehicles) spends about $162 on gas every 1,000 miles, or 16.2 cents a mile (our calculation). Charging an electric car at Montana's average home electricity price costs about $48 for the same 1,000 miles. Gas is only one part of the bill: full-coverage car insurance in Montana averages $1,668 a year.
Planning a drive? The road trip cost calculator uses today's gas price, and the true cost of owning a car puts fuel next to insurance, repairs and depreciation.
Common questions
What is the average gas price in Montana today?
Regular gas in Montana averaged $4.41 a gallon on Oct 24, 2026, per AAA. Mid-grade was $4.72, premium $5.08 and diesel $6.17.
Is gas in Montana cheaper than the national average?
No. Montana's $4.41 is 3% more than the U.S. average of $4.27, which ranks it 35 of 51 states and DC (1 = cheapest, our ranking of AAA data).
How much does it cost to fill up a car in Montana?
About $66 for 15 gallons of regular at today's Montana average (our calculation). Driving 1,000 miles in a car that gets 27.2 mpg costs about $162 in gas.
Is an electric car cheaper to run than gas in Montana?
At Montana's average home electricity price, charging an EV for 1,000 miles costs about $48, compared with about $162 in gas for a 27.2 mpg car (our calculation from EIA and AAA prices, 31 kWh per 100 miles from fueleconomy.gov).
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