Gas prices in Idaho today

As of 2026-09-09High confidenceper gallon

Regular

$4.72

= €1.07/L · $1.25/L

+11.1% vs 51-state avg

Premium

$5.26

= €1.20/L · $1.39/L

Diesel

$5.94

= €1.35/L · $1.57/L

Daily state average incl. taxes — AAA — Daily State Gas Price Averages. Midgrade: $5.00/gal.

Gas stations in Idaho

Stations color-coded by brand — the panel ranks the providers and you can filter to one brand. Move the map anywhere in Idahoand press “Search this area”.

Explore stations, fuel options and directions.

The octane step

$0.54

a gallon more for premium than regular in Idaho. How that compares with every other state, and whether your car needs it.

Idaho gas prices by metro area

AAA reports separate daily averages for 7 Idaho metros — $0.20 a gallon between the cheapest and the dearest.

Franklin$4.54 Coeur D'Alene$4.62 Lewiston$4.67 Idaho Falls$4.68 Pocatello$4.71 Twin Falls$4.72 Boise City$4.75

AAA metro averages · 2026-09-09

What a tank costs in Idaho, and how much of it is tax

Cost to fill up · regular at $4.72/gal

Compact — 12 gal$56.66
Sedan / crossover — 15 gal$70.83
SUV — 20 gal$94.44
Full-size pickup — 26 gal$122.77

From empty, at today’s Idaho average. Your vehicle and mileage →

Tax on every gallon

$0.51

$0.18 federal + $0.33 Idaho · 21 highest of 51

Where your money goes$4.21 fuel + $0.51 tax

Tax is 11% of the pump price in Idaho. Pre-tax figure is an estimate — state rates as of 2026-01-01.

Compare all 50 states’ gas taxes →

Idaho compared with neighbouring states

Where the line is worth crossing, and where it is not — each comparison shows how much of the gap is tax rather than the fuel itself.

Montana$4.41−$0.31 vs Idaho Wyoming$4.41−$0.31 vs Idaho Utah$4.64−$0.08 vs Idaho Nevada$4.99+$0.27 vs Idaho Oregon$5.06+$0.33 vs Idaho Washington$5.53+$0.81 vs Idaho

The answer, in full — and where it comes from

As of 9 September 2026, regular gasoline in Idaho averages $4.72/gal, the state average. Source: Daily fuel gauge report, AAA (a third-party aggregator, published daily). Retrieved by FuelWide on 9 September 2026.

Midgrade gasoline in Idaho averages $5.00/gal. Premium gasoline in Idaho averages $5.27/gal. Diesel in Idaho averages $5.94/gal.

Price:: $4.72/gal
Fuel:: Regular gasoline
Price basis:: State average
Applies to:: Idaho (state level)
Measured:: 2026-09-09
Retrieved:: 2026-09-09
Source:: AAA — a third-party aggregator

Daily fuel gauge report · State and metro averages: AAA · How we measure this

Frequently asked questions

How much is gas in Idaho right now?

Regular gasoline in Idaho averages $4.72 per gallon today (AAA daily state average). Midgrade is $5.00, premium $5.27 and diesel $5.94.

Is gas in Idaho expensive compared to other states?

Idaho ranks 45 of 51 states from cheapest to most expensive for regular gas this week.

Is gas in Idaho above or below the US average?

Regular in Idaho is 11.1% above the unweighted mean of AAA's 51 state averages ($4.25/gal), measured on 2026-09-09. The EIA publishes a separate, volume-weighted national average weekly; the two are different measurements and will not match.

How much tax is on a gallon of gas in Idaho?

$0.51 a gallon — $0.18 federal plus $0.33 in Idaho state taxes and fees, the 21 highest of 51 states. That is about 11% of the pump price. Rates as of 2026-01-01.

How much does it cost to fill up in Idaho?

At today's average of $4.72 a gallon, a 15-gallon sedan tank costs $70.83 to fill from empty, and a 26-gallon full-size pickup $122.77.