Colorado diesel prices today
Colorado diesel prices todayDiesel averages $6.06 a gallon in Colorado on 2 October 2026 — the 39th most expensive of 51 states, and down $0.10 on the week.
Colorado against the other states
$0.30 a gallon below the unweighted mean of AAA's 51 state averages ($6.36). The cheapest diesel is in Texas at $5.79, the dearest in California at $8.38.
Regular gas in Colorado is $4.08, so diesel costs $1.98 more per gallon — and more than premium at $4.80.
Tax on a gallon of diesel
$0.24 federal + $0.29 Colorado · 34th highest of 51. The rest — about $5.53 — is the fuel itself, refining, distribution and the retailer’s margin.
Rates as of 1 January 2026. Local taxes, where they apply, are not included.
Diesel prices by city in Colorado
AAA's diesel averages for 10 Colorado metro areas, cheapest first — $0.72 a gallon between the two ends.
| Metro area | Diesel | vs state |
|---|---|---|
| Greeley | $5.88 | −$0.18 |
| Denver | $5.97 | −$0.09 |
| Pueblo | $5.98 | −$0.08 |
| Colorado Springs | $5.98 | −$0.08 |
| Fort Collins & Loveland | $5.99 | −$0.07 |
| Boulder & Longmont | $6.09 | +$0.03 |
| Durango | $6.20 | +$0.13 |
| Grand Junction | $6.32 | +$0.26 |
| Glenwood Springs | $6.40 | +$0.34 |
| Vail | $6.60 | +$0.54 |
Show the data as a table
What a diesel fill-up costs in Colorado
- Diesel car or SUV — 18 gal$109.10
- Heavy-duty pickup — 34 gal$206.07
- Box truck — 60 gal$363.66
- Semi truck, two tanks — 250 gal$1,515.25
Diesel in neighbouring states
More for Colorado
Frequently asked questions
How much is diesel in Colorado today?
$6.06 a gallon, AAA's Colorado average for 2 October 2026 — the 39th most expensive of 51 states. Regular gasoline is $4.08, so diesel costs $1.98 more per gallon.
Are diesel prices going up in Colorado?
Diesel is down $0.10 (1.7%) on a week ago, and up $2.60 on a year ago, when it was $3.46, on AAA's own earlier averages.
Where is diesel cheapest in Colorado?
Of the 10 metro areas AAA reports in Colorado, Greeley has the cheapest diesel at $5.88 a gallon and Vail the dearest at $6.60. Individual stations vary around these averages.
How much is the diesel tax in Colorado?
$0.53 a gallon: $0.24 federal plus $0.29 in Colorado state taxes and fees, the 34th highest of 51. The state average is $0.36. Rates as of 1 January 2026.
Is diesel cheaper in a neighbouring state?
Yes — Oklahoma ($5.86, $0.20 less), Nebraska ($6.05, $0.01 less). On a 100-gallon fill that is up to $20.40; whether it is worth the drive depends on how far the border is.