Costco Gas Prices in Washington
- Regular avg
- $4.680▼ −$0.030
- Premium avg
- $5.254▼ −$0.026
- Diesel avg
- $6.899▲ +$0.018
- Stations reporting
- 34
Avg of 34 stations · per gallon · ▲▼ change since the previous day
Average price history in Washington
Last 30 days · per gallonRegular: $5.130 on Oct 2 to $4.680 on Oct 31, low $4.680, high $5.179. Premium: $5.735 on Oct 2 to $5.254 on Oct 31, low $5.254, high $5.776. Diesel: $7.067 on Oct 2 to $6.899 on Oct 31, low $6.881, high $7.092.
Costco gas in Washington today
Costco gas stations in Washington include 34 warehouses across 32 cities.
Today’s Regular prices span $0.890 across the 34 stations reporting, from the cheapest to the most expensive.
Costco Regular prices in Washington have eased about $0.448 over the past month, from $5.128 a month ago.
The furthest any single station moved was Lynnwood Business Center, down $0.730.
- Cheapest today
- Clarkston — $4.269
- Most expensive today
- Sequim — $5.159
- vs the US average
- $0.405 above, at $4.275
- Diesel
- sold at 12 of 34 stations
- Car wash
- Seattle, Bellingham
- EV charging
- Ridgefield, Richland
- Weekday opening
- 6 a.m. at all 34 stations
- Newest warehouse
- Richland — August 2025
- Oldest warehouse
- Seattle — September 1983
Washington stations by price
Cheapest first — page through to see more.
| Rank | Station | Location | Regular today |
|---|---|---|---|
| 1 | ClarkstonClarkston | Clarkston | $4.269 |
| 2 | Union GapUnion Gap | Union Gap | $4.359 |
| 3 | Vancouver WAVancouver | Vancouver | $4.359 |
| 4 | BellinghamBellingham | Bellingham | $4.369 |
| 5 | E Vancouver WACamas | Camas | $4.389 |
| 6 | Lake StevensLake Stevens | Lake Stevens | $4.499 |
| 7 | RidgefieldRidgefield | Ridgefield | $4.499 |
| 8 | TacomaTacoma | Tacoma | $4.559 |
| 9 | Burlington WABurlington | Burlington | $4.559 |
| 10 | Lynnwood Business CenterLynnwood | Lynnwood | $4.569 |
| 11 | SpokaneSpokane | Spokane | $4.599 |
| 12 | Everett WAEverett | Everett | $4.599 |
| 13 | Federal WayFederal Way | Federal Way | $4.599 |
| 14 | N SpokaneSpokane | Spokane | $4.599 |
| 15 | Aurora VillageShoreline | Shoreline | $4.599 |
| 16 | WoodinvilleWoodinville | Woodinville | $4.599 |
| 17 | LynnwoodLynnwood | Lynnwood | $4.599 |
| 18 | TumwaterTumwater | Tumwater | $4.699 |
| 19 | WenatcheeEast Wenatchee | East Wenatchee | $4.699 |
| 20 | PuyallupPuyallup | Puyallup | $4.699 |
| 21 | LaceyLacey | Lacey | $4.699 |
| 22 | Marysville WAMarysville | Marysville | $4.699 |
| 23 | SilverdaleSilverdale | Silverdale | $4.799 |
| 24 | Bonney LakeBonney Lake | Bonney Lake | $4.869 |
| 25 | TukwilaTukwila | Tukwila | $4.899 |
| 26 | KirklandKirkland | Kirkland | $4.899 |
| 27 | KennewickKennewick | Kennewick | $4.899 |
| 28 | IssaquahIssaquah | Issaquah | $4.899 |
| 29 | Gig HarborGig Harbor | Gig Harbor | $4.899 |
| 30 | Covington WACovington | Covington | $4.899 |
| 31 | RedmondRedmond | Redmond | $4.899 |
| 32 | RichlandRichland | Richland | $4.929 |
| 33 | SeattleSeattle | Seattle | $4.959 |
| 34 | SequimSequim | Sequim | $5.159 |
Fuel grades at Costco in Washington
All 34 Costco gas stations in Washington sell Kirkland Signature fuel, which is Top Tier certified. Diesel is sold at 12 of the 34.
| Grade | Stations | Avg today | Cheapest |
|---|---|---|---|
| Regular | 34 | $4.680 | Clarkston $4.269 |
| Premium | 34 | $5.254 | Union Gap $4.859 |
| Diesel | 12 | $6.899 | Clarkston $6.499 |
Regular
all 34 stations87-octane Kirkland Signature unleaded, the grade most cars are built for.
- Same TOP TIER detergent package as premium. The only difference between the two is octane.
- Can contain up to 10% ethanol, like most US gasoline. The pump label shows the blend.
Premium
all 34 stationsKirkland Signature premium: 91 octane at most stations, 93 in some regions.
- Only needed if your owner’s manual requires or recommends premium. Higher octane resists engine knock; it adds nothing to an engine built for regular.
- Carries the same detergent additives as regular.
Diesel
12 of 34 stationsKirkland Signature diesel, ultra-low-sulfur like all on-road diesel in the US.
- Costco says its diesel additives clean deposits from fuel injectors, keep new ones from forming and help reduce engine wear.
Not sold at Costco
- Mid-grade (89): Costco pumps offer regular and premium only.
- Cash sales: every Costco pump is card-only.
Is Costco gas in Washington good quality?
Costco does not sell a refiner’s brand. Every pump in Washington dispenses Costco’s own Kirkland Signature fuel, bought from major refiners and distributors in the region and finished with Costco’s additive package.
Kirkland Signature gasoline is licensed TOP TIER, the detergent standard set by automakers including GM, Ford, Toyota, Honda and BMW. Costco puts its detergent level at about five times the EPA minimum, which is what keeps intake valves and fuel injectors clear of carbon deposits. Costco’s gasoline also contains friction modifiers that it says reduce engine wear.
In short, the low price is not a lower grade. The saving comes from Costco running its gas as a membership perk on thin margins, not from the fuel.
Costco gas station hours in Washington
On weekdays the earliest pumps in Washington come on at 6 a.m. (Aurora Village) and the last ones switch off at 10 p.m. (Aurora Village). Pump hours run longer than the warehouse's, and weekends are shorter. Times are local.
| Station | Mon–Fri | Sat | Sun |
|---|---|---|---|
| Aurora Village | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Bellingham | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Bonney Lake | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Burlington WA | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Clarkston | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Covington WA | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| E Vancouver WA | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Everett WA | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Federal Way | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Gig Harbor | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Issaquah | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Kennewick | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Kirkland | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Lacey | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Lake Stevens | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Lynnwood | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Lynnwood Business Center | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Marysville WA | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| N Spokane | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Puyallup | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Redmond | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Richland | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Ridgefield | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Seattle | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Sequim | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Silverdale | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Spokane | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Tacoma | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Tukwila | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Tumwater | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Union Gap | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Vancouver WA | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Wenatchee | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Woodinville | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
What else is at Costco warehouses in Washington
Every Costco gas station sits in a warehouse parking lot, so a fill-up can share a trip with the rest of the list. 2 warehouses in Washington also have a car wash. EV charging is on site at 2.
- Food court
- 33 of 34
- Pharmacy
- 33 of 34
- Optical
- 33 of 34
- Tire center
- 33 of 34
- Car wash
- 2 of 34
- EV charging
- 2 of 34
Car wash: Seattle, Bellingham. EV charging: Ridgefield, Richland.
How Costco gas works in Washington
Bring your card. The pump asks for an active Costco membership card before it starts, at all 34 gas stations in Washington. Without a membership, a Costco Shop Card loaded with credit works the same way.
Pay by card. The pumps take Visa, most debit cards and the Costco Shop Card. There is no cash, and a card hold of up to $150 can show until the fill posts.
Check the price first. Each station sets its own price, usually once a day, so two Costco stations in Washington can differ. Today the regular average here is $4.680. The prices on this page are collected once daily and can lag a same-day change at the pump.
Go early or late. Lines are longest on weekend afternoons and weekday evenings. The first pumps here open at 6 a.m. on weekdays.
Washington prices by city
- Bellingham · 1 station$4.369
- Bonney Lake · 1 station$4.869
- Burlington · 1 station$4.559
- Camas · 1 station$4.389
- Clarkston · 1 station$4.269
- Covington · 1 station$4.899
- East Wenatchee · 1 station$4.699
- Everett · 1 station$4.599
- Federal Way · 1 station$4.599
- Gig Harbor · 1 station$4.899
- Issaquah · 1 station$4.899
- Kennewick · 1 station$4.899
- Kirkland · 1 station$4.899
- Lacey · 1 station$4.699
- Lake Stevens · 1 station$4.499
- Lynnwood · 2 stations$4.584
- Marysville · 1 station$4.699
- Puyallup · 1 station$4.699
- Redmond · 1 station$4.899
- Richland · 1 station$4.929
- Ridgefield · 1 station$4.499
- Seattle · 1 station$4.959
- Sequim · 1 station$5.159
- Shoreline · 1 station$4.599
- Silverdale · 1 station$4.799
- Spokane · 2 stations$4.599
- Tacoma · 1 station$4.559
- Tukwila · 1 station$4.899
- Tumwater · 1 station$4.699
- Union Gap · 1 station$4.359
- Vancouver · 1 station$4.359
- Woodinville · 1 station$4.599
States near Washington
- Costco gas prices Oregon · 13 stations$4.442
- Costco gas prices Idaho · 7 stations$4.220
- Costco gas prices Montana · 5 stations$4.151
- Costco gas prices Utah · 16 stations$4.283
- Costco gas prices Nevada · 9 stations$4.752
- Costco gas prices California · 129 stations$5.453
Costco gas in Washington: common questions
Where is the cheapest Costco gas in Washington today?
Clarkston posts the lowest Regular price in Washington, $4.269 as of the October 31, 2026 reading — $0.890 under Sequim, the most expensive of the 34 stations reporting.
How many Costco gas stations are there in Washington?
Washington has 34 Costco warehouses with a gas station, across 32 cities, and all of them reported a price in the last 30 days.
Which Costco gas stations in Washington sell diesel?
Diesel is sold at 12 of 34 stations in Washington. Each station page lists the grades that warehouse has actually posted a price for in the last 30 days.
Is Costco gas cheaper in Washington than in the US?
No — the average Costco Regular price in Washington is $4.680, $0.405 above the US average of $4.275 as of the October 31, 2026 reading.
Are Costco gas prices in Washington going up or down?
Down — the average Costco Regular price in Washington has eased about $0.448 over the past month, from $5.128 to $4.680.
What time do Costco gas stations in Washington open?
The pumps open at 6 a.m. on weekdays at all 34 stations, ahead of the warehouse doors. Each station page carries its own full week, in local time.