Gas prices in Idaho today
Regular gas in Idaho averages $4.70 a gallon, 10% more than the U.S. average of $4.27. That makes Idaho one of the most expensive: rank 43 of 51 (1 = cheapest).
| Grade | Idaho | U.S. average | 15-gallon fill-up |
|---|---|---|---|
| Regular | $4.70 | $4.27 | $70 |
| Mid-grade | $5.01 | $4.78 | $75 |
| Premium | $5.28 | $5.17 | $79 |
| Diesel | $6.52 | $6.35 | $98 |
Source: AAA, Idaho 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 Idaho page.
Taxes in the price: 33.0¢ a gallon in Idaho state taxes and fees plus the 18.4¢ federal tax, 51.4¢ in all, about 11% of today's price (Tax Foundation, July 2026; our calculation). Gas tax in Idaho.
What driving costs in Idaho
At $4.70 a gallon, a car that gets 27.2 mpg (the EPA's average for new vehicles) spends about $173 on gas every 1,000 miles, or 17.3 cents a mile (our calculation). Charging an electric car at Idaho's average home electricity price costs about $41 for the same 1,000 miles. Gas is only one part of the bill: full-coverage car insurance in Idaho averages $1,284 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 Idaho today?
Regular gas in Idaho averaged $4.70 a gallon on Oct 24, 2026, per AAA. Mid-grade was $5.01, premium $5.28 and diesel $6.52.
Is gas in Idaho cheaper than the national average?
No. Idaho's $4.70 is 10% more than the U.S. average of $4.27, which ranks it 43 of 51 states and DC (1 = cheapest, our ranking of AAA data).
How much does it cost to fill up a car in Idaho?
About $70 for 15 gallons of regular at today's Idaho average (our calculation). Driving 1,000 miles in a car that gets 27.2 mpg costs about $173 in gas.
Is an electric car cheaper to run than gas in Idaho?
At Idaho's average home electricity price, charging an EV for 1,000 miles costs about $41, compared with about $173 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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