Ontario has 43 Costco warehouses, including 1 with diesel fuel and 28 with gasoline. Use our interactive map to search by ZIP code or city, or browse the diesel station list below.
→ Search for Costco stations near you in Ontario
Ontario is Costco's densest market in Canada, with 43 warehouses across the province — including 28 locations with gasoline. From Toronto and Mississauga to Ottawa, Hamilton, and London, Costco gas stations consistently undercut nearby competitors by 10 to 30 cents per litre. In a province where fuel taxes are among the highest in North America, Costco membership pricing provides meaningful relief for daily commuters, families, and commercial drivers alike.
Because gas prices in Ontario fluctuate daily based on global crude markets, provincial carbon pricing, and regional supply logistics, we do not post specific per-litre prices on this page. To find the Costco fuel center nearest you, search the Ontario station map. If you are weighing Costco fuel against name-brand competitors, our comparison of Costco diesel vs. Shell diesel breaks down quality and value differences.
Despite having 43 warehouses, Ontario currently has only 1 Costco location with diesel fuel — in London (north). This station serves drivers along the Hwy 401 and Hwy 402 corridors, including those heading toward the US border or Sarnia. For diesel truck owners and RV enthusiasts in the Greater Toronto Area, Ottawa, or Hamilton, this unfortunately means a significant drive for Costco diesel. Costco has been expanding its Canadian diesel network, so additional Ontario locations may add diesel in the future.
Costco diesel is ultra-low sulfur diesel (ULSD) that meets all Canadian and EPA standards. If you are wondering whether Costco diesel is good quality, the fuel is sourced from major refineries and includes detergent additives. Ontario's cold winters demand attention to fuel conditioning — cold-flow diesel fuel additives are strongly recommended to prevent gelling and ensure reliable starts when temperatures drop well below freezing.
Costco fuel stations in Ontario typically operate from 6:00 AM to 10:00 PM on weekdays, with reduced weekend hours. Hours may vary by location and season. A Costco membership is required at the pump, and Executive members earn 2% cash back on gas purchases subject to the annual reward cap. For more details about membership types, accepted payment methods, and fuel station policies, visit our FAQ page.
Every Costco warehouse in Ontario that offers diesel fuel:
| Warehouse | Address | Phone | Diesel Hours |
|---|---|---|---|
| Costco Warehouse - N London | 693 Wonderland Rd N, London, ON | (519) 474-5301 | See station details |
Costco fuel stations consistently offer some of the lowest diesel prices in Ontario. Costco members can save significantly on diesel for trucks, RVs, and commercial vehicles. Diesel at Costco is typically high-quality, additized ultra-low sulfur diesel (ULSD).