Wyoming diesel prices today
Wyoming diesel prices todayDiesel averages $6.21 a gallon in Wyoming on 2 October 2026 — the 31st most expensive of 51 states, and down $0.06 on the week.
Wyoming against the other states
$0.15 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 Wyoming is $4.48, so diesel costs $1.73 more per gallon — and more than premium at $5.11.
Tax on a gallon of diesel
$0.24 federal + $0.24 Wyoming · 43rd highest of 51. The rest — about $5.73 — 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 Wyoming
AAA's diesel averages for 2 Wyoming metro areas, cheapest first — $0.12 a gallon between the two ends.
Show the data as a table
What a diesel fill-up costs in Wyoming
- Diesel car or SUV — 18 gal$111.82
- Heavy-duty pickup — 34 gal$211.21
- Box truck — 60 gal$372.72
- Semi truck, two tanks — 250 gal$1,553.00
Diesel in neighbouring states
More for Wyoming
Frequently asked questions
How much is diesel in Wyoming today?
$6.21 a gallon, AAA's Wyoming average for 2 October 2026 — the 31st most expensive of 51 states. Regular gasoline is $4.48, so diesel costs $1.73 more per gallon.
Are diesel prices going up in Wyoming?
Diesel is down $0.06 (0.9%) on a week ago, and up $2.63 on a year ago, when it was $3.58, on AAA's own earlier averages.
Where is diesel cheapest in Wyoming?
Of the 2 metro areas AAA reports in Wyoming, Cheyenne has the cheapest diesel at $6.00 a gallon and Casper the dearest at $6.11. Individual stations vary around these averages.
How much is the diesel tax in Wyoming?
$0.48 a gallon: $0.24 federal plus $0.24 in Wyoming state taxes and fees, the 43rd highest of 51. The state average is $0.36. Rates as of 1 January 2026.
Is diesel cheaper in a neighbouring state?
Yes — South Dakota ($6.03, $0.18 less), Nebraska ($6.05, $0.17 less), Colorado ($6.06, $0.15 less). On a 100-gallon fill that is up to $18.40; whether it is worth the drive depends on how far the border is.