What is the current diesel price in Idaho?

The current diesel price in Idaho is $5.45 per gallon as of August 18, 2026, according to AAA Gas Prices daily state diesel averages. This is $0.00 below the US national average of $5.45/gal. Idaho ranks #28 of 50 states by diesel price.

What is the diesel tax in Idaho?

Idaho's state diesel tax is 32 cents per gallon. Combined with the federal diesel tax of 24.4 cents per gallon, the total tax burden on a gallon of diesel in Idaho is 56.4 cents (10% of the retail price).

Updated August 18, 2026 - AAA daily average

Diesel Cost per Gallon in Idaho (2026)

$5.45/GAL

0.00 vs US average ($5.45)Rank #28 of 50 statesPADD 4

Diesel Tax Breakdown

Federal diesel excise tax24.4c/gal

Idaho state diesel tax32.0c/gal

Total tax56.4c/gal

Tax as % of price10%

Sources: Federation of Tax Administrators, EIA. Rates as of April 2026.

Nearby States Comparison

$5.30-0.15

$5.42-0.03

$5.40-0.05

$5.74+0.29

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Sources: State diesel average from AAA Gas Prices (gasprices.aaa.com), August 18, 2026; US average and PADD context from the EIA Weekly On-Highway Diesel Fuel Survey (August 17, 2026); state tax from the Federation of Tax Administrators diesel tax table. State prices are representative averages; actual pump prices vary by retailer and location.

- US Average - All States - Trip Calculator - Diesel vs Gas - Fleet Cards