Diesel Prices in Idaho Today
Average diesel price in Idaho: $6.466 per gallon on October 20, 2026. EIA U.S. weekly average $6.276. Current
What is the price of diesel in Idaho today?
Diesel in Idaho averages $6.466 per gallon (AAA daily state average, October 20, 2026), $0.190 more than the U.S. average of $6.276. Idaho ranks #39 of 51 for cheapest diesel (1 = cheapest). A loaded semi at about 6.3 mpg spends about $1.03 per mile on fuel in Idaho.
per gallon, October 20, 2026
U.S. average $6.276
of 51 (1 = cheapest)
semi truck, today price
Fuel cost per mile in Idaho
Estimated diesel cost at the today Idaho price of $6.466 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 | $1.03 | $1,029 |
| Reefer38,000 lbs, ~6.0 mpg | $1.07 | $1,071 |
| Flatbed40,000 lbs, ~6.0 mpg | $1.07 | $1,069 |
| Hotshot12,000 lbs, ~8.9 mpg | $0.73 | $726 |
| Box Truck7,000 lbs, ~9.1 mpg | $0.71 | $709 |
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 Idaho today?
Diesel in Idaho averages $6.466 per gallon (AAA daily state average, October 20, 2026), $0.190 more than the U.S. average of $6.276. Idaho ranks #39 of 51 for cheapest diesel (1 = cheapest). A loaded semi at about 6.3 mpg spends about $1.03 per mile on fuel in Idaho.
How much does it cost to fill a semi truck in Idaho?
At $6.47 a gallon, 150 gallons of diesel costs about $970 and 200 gallons about $1,293 in Idaho at the today average.
Is diesel cheaper in Idaho than nearby states?
Among nearby states in the same region, the cheapest today is Montana at $6.172 a gallon. Idaho is $6.466.
How often are Idaho diesel prices updated?
The page checks for new prices twice a day. AAA publishes daily state averages; the EIA weekly regional average is shown only if a state has no daily value. If a source stops updating, the last value stays with its real date and a stale label.
| Montana | $6.172 |
| Wyoming | $6.363 |
| Utah | $6.429 |
| Colorado | $6.605 |
Source: AAA daily state average, October 20, 2026. All 50 states
Running freight through Idaho?
Texas Solutions dispatches semis for 5%, hotshots for 7% and box trucks for 8% of weekly gross. We plan lanes to cut empty miles and fuel.
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