What is the current diesel price in Montana?

The current diesel price in Montana is $5.03 per gallon as of July 28, 2026, according to AAA Gas Prices daily state diesel averages. This is $0.10 below the US national average of $5.13/gal. Montana ranks #15 of 50 states by diesel price.

What is the diesel tax in Montana?

Montana's state diesel tax is 27.75 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 Montana is 52.1 cents (10% of the retail price).

Updated July 28, 2026 - AAA daily average

Diesel Cost per Gallon in Montana (2026)

$5.03/GAL

-0.10 vs US average ($5.13)Rank #15 of 50 statesPADD 4

Diesel Tax Breakdown

Federal diesel excise tax24.4c/gal

Montana state diesel tax27.8c/gal

Total tax52.1c/gal

Tax as % of price10%

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

Nearby States Comparison

$4.92-0.11

$4.90-0.13

$5.05+0.02

$5.23+0.20

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Sources: State diesel average from AAA Gas Prices (gasprices.aaa.com), July 28, 2026; US average and PADD context from the EIA Weekly On-Highway Diesel Fuel Survey (July 20, 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