Washington diesel prices today
Washington diesel prices todayDiesel averages $7.37 a gallon in Washington on 2 October 2026 — the 2nd most expensive of 51 states, and down $0.09 on the week.
Washington against the other states
$1.01 a gallon above 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 Washington is $5.49, so diesel costs $1.88 more per gallon — and more than premium at $6.02.
Tax on a gallon of diesel
$0.24 federal + $0.53 Washington · 7th highest of 51. The rest — about $6.60 — 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 Washington
AAA's diesel averages for 14 Washington metro areas, cheapest first — $0.52 a gallon between the two ends.
| Metro area | Diesel | vs state |
|---|---|---|
| Clarkson | $7.00 | −$0.38 |
| Bellingham | $7.11 | −$0.27 |
| Vancouver | $7.13 | −$0.25 |
| Longview | $7.19 | −$0.19 |
| Mount Vernon & Anacortes | $7.22 | −$0.15 |
| Yakima | $7.26 | −$0.11 |
| Spokane | $7.33 | −$0.05 |
| Bremerton | $7.33 | −$0.05 |
| Olympia | $7.38 | +$0.01 |
| Wenatchee | $7.39 | +$0.01 |
| Richland, Kennewick & Pasco | $7.41 | +$0.03 |
| Tacoma | $7.41 | +$0.03 |
| Seattle, Bellevue & Everett | $7.51 | +$0.13 |
| Walla Walla | $7.52 | +$0.15 |
Show the data as a table
What a diesel fill-up costs in Washington
- Diesel car or SUV — 18 gal$132.73
- Heavy-duty pickup — 34 gal$250.72
- Box truck — 60 gal$442.44
- Semi truck, two tanks — 250 gal$1,843.50
Diesel in neighbouring states
More for Washington
Frequently asked questions
How much is diesel in Washington today?
$7.37 a gallon, AAA's Washington average for 2 October 2026 — the 2nd most expensive of 51 states. Regular gasoline is $5.49, so diesel costs $1.88 more per gallon.
Are diesel prices going up in Washington?
Diesel is down $0.09 (1.2%) on a week ago, and up $2.31 on a year ago, when it was $5.07, on AAA's own earlier averages.
Where is diesel cheapest in Washington?
Of the 14 metro areas AAA reports in Washington, Clarkson has the cheapest diesel at $7.00 a gallon and Walla Walla the dearest at $7.52. Individual stations vary around these averages.
How much is the diesel tax in Washington?
$0.77 a gallon: $0.24 federal plus $0.53 in Washington state taxes and fees, the 7th highest of 51. The state average is $0.36. Rates as of 1 January 2026.
Is diesel cheaper in a neighbouring state?
Yes — Idaho ($6.53, $0.84 less), Oregon ($6.82, $0.56 less). On a 100-gallon fill that is up to $84.00; whether it is worth the drive depends on how far the border is.