Diesel Prices in Montana Today
Average diesel price in Montana: $6.313 per gallon on September 22, 2026. U.S. average $6.529. Updated daily.
What is the price of diesel in Montana today?
Diesel in Montana averages $6.313 per gallon today (September 22, 2026), $0.216 less than the U.S. average of $6.529. Montana ranks #17 of 51 for cheapest diesel (1 = cheapest). A loaded semi at about 6.3 mpg spends about $1.00 per mile on fuel in Montana.
per gallon today
U.S. average $6.529
of 51 (1 = cheapest)
semi truck, today
Fuel cost per mile in Montana
Estimated diesel cost at today's Montana price of $6.313 a gallon, using fuel economy calibrated to FHWA and NACFE data.
| Truck | Fuel per mile | Fuel per 1,000 miles |
|---|---|---|
| Dry Van38,000 lbs, ~6.3 mpg | $1.00 | $1,004 |
| Reefer38,000 lbs, ~6.0 mpg | $1.05 | $1,046 |
| Flatbed40,000 lbs, ~6.0 mpg | $1.04 | $1,044 |
| Hotshot12,000 lbs, ~8.9 mpg | $0.71 | $709 |
| Box Truck7,000 lbs, ~9.1 mpg | $0.69 | $692 |
Your numbers depend on load weight, speed, terrain and idling. Enter them in the truck fuel cost calculator for an exact estimate.
Frequently asked questions
What is the price of diesel in Montana today?
Diesel in Montana averages $6.313 per gallon today (September 22, 2026), $0.216 less than the U.S. average of $6.529. Montana ranks #17 of 51 for cheapest diesel (1 = cheapest). A loaded semi at about 6.3 mpg spends about $1.00 per mile on fuel in Montana.
How much does it cost to fill a semi truck in Montana?
At $6.31 a gallon, 150 gallons of diesel costs about $947 and 200 gallons about $1,263 in Montana today.
Is diesel cheaper in Montana than nearby states?
Among nearby states in the same region, the cheapest today is Wyoming at $6.215 a gallon. Montana is $6.313.
How often are Montana diesel prices updated?
Every day. This page refreshes each morning from daily state averages, with the EIA weekly survey as a backup.
| Wyoming | $6.215 |
| Colorado | $6.220 |
| Utah | $6.564 |
| Idaho | $6.590 |
Source: AAA daily state average, September 22, 2026. All 50 states
Running freight through Montana?
Texas Solutions dispatches semis for 5%, hotshots for 8% and box trucks for 10% of weekly gross. We plan lanes to cut empty miles and fuel.