What is the current diesel price in Colorado?

The current diesel price in Colorado is $5.59 per gallon as of August 18, 2026, according to AAA Gas Prices daily state diesel averages. This is $0.14 above the US national average of $5.45/gal. Colorado ranks #43 of 50 states by diesel price.

What is the diesel tax in Colorado?

Colorado's state diesel tax is 20.5 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 Colorado is 44.9 cents (8% of the retail price).

Updated August 18, 2026 - AAA daily average

Diesel Cost per Gallon in Colorado (2026)

$5.59/GAL

+0.14 vs US average ($5.45)Rank #43 of 50 statesPADD 4

Diesel Tax Breakdown

Federal diesel excise tax24.4c/gal

Colorado state diesel tax20.5c/gal

Total tax44.9c/gal

Tax as % of price8%

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

Nearby States Comparison

$5.40-0.19

$5.42-0.17

$5.10-0.49

$5.08-0.51

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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