Colorado diesel tax rate is 32.5¢ per gallon for 2026. Calculate your quarterly IFTA fuel tax liability for Colorado routes.
Colorado's 2Q 2026 Special Diesel rate is 32.5¢/gal. Denver is a major distribution hub for the Mountain West, and I-70 through the Rockies is one of the most challenging (and critical) freight routes in the country.
I-25 (Denver–Pueblo–New Mexico, north-south spine), I-70 (Kansas City–Denver–Grand Junction–Utah, primary east-west mountain corridor), I-76 (Denver–Nebraska), I-80 (runs through NE corner)
I-70 through the Eisenhower/Johnson Tunnel and the mountain passes requires careful trip planning — commercial trucks face seasonal restrictions, chain laws, and hazardous conditions. The Denver metro's warehouse boom along I-25 and E-470 has made Colorado one of the fastest-growing regional distribution markets.
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