Costco Washington Gas Prices
Find the cheapest Costco gas in Washington— every fuel center ranked by today's price.
33 Costco fuel centers in 32 cities · 12 of 33 sell diesel
Costco operates 33 fuel centers in Washington across 32 cities, with the largest cluster in Spokane (2 stations). Across the state, regular gas averages $4.580, premium runs about $0.54 higher at $5.121, and diesel sits at $5.360. The lowest-priced regular pump is at Costco Union Gap in Union Gap at $4.059, while Sequim in Sequim sits about $1.28 higher. Across the state, regular pump prices have eased about $0.58 over the past month, from $5.163 a month ago. Premium has eased about $0.53 and diesel has eased about $0.71 over the same period. Diesel is sold at 12 of the 33 Washington locations.
If your vehicle takes premium, the lowest in Washington is Costco Union Gap in Union Gap at $4.459. The cheapest diesel is at Costco Bellingham in Bellingham at $4.899. Pump prices shift from one warehouse to the next with local taxes, fuel-blend rules, and transport costs, but Costco fuel is members-only and usually runs below nearby branded stations — which is what keeps these pumps busy.
30-day Washington average price trend
Browse Washington cities
All Washington stations by price
| Station | Regular | Premium |
|---|---|---|
| Union Gap Union Gap | $4.059 | $4.459 |
| Clarkston Clarkston | $4.099 | $4.499 |
| Bellingham Bellingham | $4.199 | $4.659 |
| Burlington Burlington | $4.199 | $4.699 |
| N Spokane Spokane | $4.249 | $4.799 |
| Spokane Spokane | $4.249 | $4.799 |
| Wenatchee East Wenatchee | $4.299 | $4.899 |
| Puyallup Puyallup | $4.359 | $5.199 |
| Tacoma Tacoma | $4.359 | $4.899 |
| E Vancouver Camas | $4.399 | $4.859 |
Frequently asked questions
Which Costco has the cheapest gas in Washington?
As of the latest daily update, Costco Union Gap in Union Gap has the cheapest regular gas in Washington at $4.059 USD per gallon. Pump prices change daily, so check the ranking on this page for the current order.
How much is Costco gas in Washington right now?
Across the 33 Costco fuel centers in Washington, regular averages $4.580 USD per gallon, premium $5.121, and diesel $5.360. Those are averages of the latest pump prices — individual stations vary, so see the per-station table on this page.
Does Costco sell diesel in Washington?
Yes — 12 of the 33 Costco fuel centers in Washington sell diesel, averaging $5.360 USD per gallon. Availability varies by warehouse, so check the table above first.
Is Costco gas in Washington cheaper than average?
Washington Costco regular averages $4.580, about $0.76 higher than the national U.S. Costco average of $3.823. Wherever you fill up, Costco fuel is usually priced below nearby branded stations.
Do you need a Costco membership to buy gas in Washington?
Yes — Costco gas stations in Washington are members-only. You scan a membership card or a Costco Shop Card at the pump before fueling; non-members can't buy fuel at Costco.
How do you pay for gas at Costco in Washington?
Costco gas stations in Washington take any Visa credit card, PIN debit, a Costco Shop Card, and Apple Pay or Google Pay linked to a Visa — but not Mastercard, Amex, Discover, or cash at the pump.
What time do Costco gas stations open in Washington?
Hours vary by location, and the gas station usually opens earlier and closes later than the warehouse itself. For example, the gas station at Costco Union Gap runs 6AM – 10PM on weekdays. Check the individual station page for exact hours before a long drive.