Everything you need to know about Costco fuel stations, diesel availability, and how to use costcodiesel.com to find the cheapest fuel near you.
As of 2026, approximately 71 of the 769 Costco warehouses with fuel stations offer diesel. Costco has been rapidly expanding diesel availability, particularly in California (15 locations), Washington (11), Texas (5), Utah (5), and Ohio (3). Use our interactive map to find the nearest Costco diesel location by entering your ZIP code and toggling "Diesel only".
California leads with 15 Costco diesel locations, followed by Washington (11), Texas (5), Utah (5), and Ohio (3). Browse our state pages for detailed lists:
Yes. Costco diesel pumps are designed to accommodate RVs and larger trucks. Many locations have dedicated diesel lanes with high-flow nozzles. However, not all Costco fuel stations have diesel — only about 71 of 769 locations currently offer it. Use costcodiesel.com to find diesel-friendly locations along your route.
Yes. All diesel sold at Costco is ultra-low sulfur diesel (ULSD) with a maximum of 15 ppm sulfur content, meeting EPA requirements. Costco diesel is also additized with detergent additives to keep fuel systems clean and improve engine performance.
Yes, a valid Costco membership is required to purchase fuel at Costco gas stations. This applies to both gasoline and diesel. Your Costco membership card is used as payment identification at the pump. In some states, non-members may be able to use Costco gas stations if they have a Costco Shop Card (gift card), but this varies by location.
Costco gas is typically 10-30 cents per gallon cheaper than competing stations in the same area. The savings come from Costco's high-volume, low-overhead model. For diesel, savings can be even more significant, especially in states like California and Washington where diesel prices are higher.
Costco gas stations accept Visa credit cards (in the US), debit cards, Costco Shop Cards, and Costco Anywhere Visa cards. In Canada, Mastercard is accepted. Payment methods are the same at the pump as inside the warehouse.
Costco gas station hours vary by location but are typically 6:00 AM to 9:30 PM on weekdays and 6:00 AM to 8:00 PM on weekends. Diesel hours may differ from gasoline hours at some locations. Always check specific location hours on our map before making a special trip.
Yes — Costco gas stations are open on Sundays, typically from 6:00 AM to 7:00 or 8:00 PM, depending on the location. Sunday hours are usually shorter than weekday hours, and some smaller or rural locations may have more limited Sunday schedules. The gas station opens before the warehouse on Sundays, so you can fuel up even if the warehouse itself is still closed. Check our interactive map for specific Sunday hours at your local Costco.
Costco gas stations are closed on Thanksgiving, Christmas, and New Year's Day, and may have reduced hours on Christmas Eve, New Year's Eve, Independence Day, Labor Day, and Memorial Day. On most other federal holidays, gas stations operate on normal or slightly reduced schedules. Because holiday hours vary by location and are set at the warehouse level, we recommend checking the specific location on our map before heading out on a holiday.
Most Costco gas stations close between 8:00 PM and 10:00 PM depending on the day of the week and the location. Weekday closing times are typically later (9:30–10:00 PM) than weekend closing times (7:00–8:00 PM). Some high-traffic locations in major metro areas may stay open as late as 10:00 PM seven days a week. The warehouse and the gas station have separate hours — the gas station usually opens earlier and closes later than the warehouse.
Most Costco gas stations open between 5:30 AM and 6:30 AM on weekdays, and 6:00 AM on weekends. The gas station typically opens 1–2 hours before the warehouse itself, making it popular with early commuters and commercial drivers. A few locations (such as Mission Valley in San Diego) open as early as 4:30 AM on weekdays. Check specific opening times on our map.
We pull location data directly from Costco's public API and update regularly. If you spot incorrect information or a missing location, please contact us and we'll verify and update it.
No. costcodiesel.com is an independent project not affiliated with, endorsed by, or sponsored by Costco Wholesale Corporation. "Costco" is a registered trademark of Costco Wholesale Corporation. We use publicly available location data to help drivers find fuel.
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