Costco Gas Prices in UNION GAP, Washington Today
2310 Longfibre Rd, UNION GAP, WA 98903-1513
The Costco fuel station in UNION GAP, Washington is one of the most cost-effective places to purchase diesel in the area. Diesel availability varies — check the fuel type filter on the station listing for the latest status, with regular unleaded at $4.750. All prices are updated daily from live pump data. A Costco membership ($65/year) is required to purchase fuel at this location. Truck drivers, fleet operators, and diesel vehicle owners typically save 10–30 cents per gallon compared to nearby retail stations — use the fuel cost calculator to see what that means for your annual mileage.
Today's Prices
Updated 7 hrs agoMembership required. You need an active membership to purchase fuel at this location.
Washington Regular Gas Price Trend (30 days)
Source: EIAStation Information
- Address
- 2310 Longfibre Rd, UNION GAP, WA 98903-1513
- Weekday Hours
- 6:00 AM - 10:00 PM
- Saturday
- N/A
- Sunday
- N/A
- Membership
- Required — $65/year
Location
Loading map…
Frequently Asked Questions — Costco UNION GAP
This Costco location in UNION GAP does not currently carry diesel fuel. Check nearby Costco locations using our station finder, as diesel availability varies by site.
Pro Tips for UNION GAP Costco Gas
- 1
Diesel pump location: At most Costco locations, diesel pumps are on a separate island — often at the end of the fueling canopy or in a dedicated commercial lane. Look for the yellow or black diesel nozzle handle.
- 2
Best time for diesel: Weekday mornings (Tuesday–Thursday, 7–9 AM) have the shortest wait times at this UNION GAP location. Diesel lanes generally move faster than gasoline lanes because fewer vehicles use them.
- 3
Track prices before your route: Costco updates diesel prices daily based on wholesale distillate costs. If you're planning a long haul through UNION GAP, bookmark this page and check the price the morning of your trip.
- 4
Maximize fleet savings: Stack your Costco membership discount with a commercial fleet card or cash-back credit card. The Costco Anywhere Visa gives 4% back on fuel purchases (up to $7,000/year). Sam's Club Mastercard returns 5% on fuel. On high-volume diesel fills, those percentages add up quickly.
Quick Facts
- ✓Prices updated daily
- ✓Extended hoses reach both sides
- ✓No diesel at this location
- ✓Costco membership required