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Costco Gas Prices in Ontario

Regular avg
158.4¢▼ −0.1¢
Premium avg
182.7¢▼ −0.2¢
Diesel avg
241.9¢▼ −1.0¢
Stations reporting
28

Avg of 28 stations · ¢ per litre · ▲▼ change since the previous day

Average price history in Ontario

Last 30 days · ¢ per litre
RegularPremiumDiesel

Regular: 173.1¢ on Oct 2 to 158.4¢ on Oct 31, low 156.4¢, high 177.9¢. Premium: 195.7¢ on Oct 2 to 182.7¢ on Oct 31, low 181.6¢, high 200.9¢. Diesel: 239.9¢ on Oct 2 to 241.9¢ on Oct 31, low 238.9¢, high 244.9¢.

Costco gas in Ontario today

Costco gas bars in Ontario include 28 warehouses across 22 cities.

Today’s Regular prices span 18.0¢ across the 28 stations reporting, from the cheapest to the most expensive.

2 stations are tied at today’s lowest price.

Costco Regular prices in Ontario have eased about 19.4¢ over the past month, from 177.9¢ a month ago.

The furthest any single station moved was C Mississauga, down 26.0¢.

Cheapest today
N Oshawa — 147.9¢
Most expensive today
S London — 165.9¢
vs the Canadian average
4.3¢ below, at 162.7¢
Diesel
sold at 1 of 28 stations
Newest warehouse
East Gwillimbury Business Centre — December 2025
Oldest warehouse
Vaughan — October 1990

Ontario stations by price

Cheapest first — page through to see more.

Cheapest Costco gas stations ranked by regular price
RankStationRegular today
1OshawaOshawa147.9¢
2N OshawaOshawa147.9¢
3AjaxAjax151.9¢
4GloucesterGloucester152.9¢
5NepeanNepean152.9¢
6SudburySudbury152.9¢
7BarrhavenNepean152.9¢
8Stoney CreekStoney Creek155.9¢
9N MississaugaMississauga156.9¢
10Scarborough ONScarborough156.9¢
Showing 1–10 of 28 stations
Page 1 of 3

Fuel grades at Costco in Ontario

All 28 Costco gas bars in Ontario sell Kirkland Signature fuel, which is Top Tier certified. Diesel is sold at 1 of the 28.

Fuel grades at Costco in Ontario
GradeStationsAvg todayCheapest
Regular28158.4¢Oshawa 147.9¢
Premium28182.7¢Oshawa 172.9¢
Diesel1241.9¢N London 241.9¢

Regular

all 28 stations

Kirkland Signature regular unleaded, the grade most cars are built for.

  • Costco says it carries five times the detergent the Canadian General Standards Board requires.
  • Same detergent level as premium.

Premium

all 28 stations

Kirkland Signature premium, a higher-octane grade.

  • Only needed if your owner’s manual requires or recommends premium.
  • Carries the same five-times-CGSB detergent level as regular.

Diesel

1 of 28 stations

Kirkland Signature diesel, ultra-low-sulfur like all on-road diesel in Canada.

  • Costco says its diesel additives clean deposits from fuel injectors and help reduce engine wear.

Not sold at Costco

  • Mid-grade: Costco pumps offer regular and premium only.
  • Cash sales: every Costco pump is card-only.

Is Costco gas in Ontario good quality?

Costco does not sell a refiner’s brand. Every pump in Ontario dispenses Costco’s own Kirkland Signature fuel, bought from major refiners and distributors in the region and finished with Costco’s additive package.

Costco Canada has been a listed TOP TIER gasoline retailer since December 2014. TOP TIER is the detergent standard set by automakers including GM, Ford, Toyota, Honda and BMW, and Costco says Kirkland Signature gasoline carries five times the detergent the Canadian General Standards Board requires, in both regular and premium.

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 bar hours in Ontario

On weekdays the earliest pumps in Ontario come on at 6 a.m. (Ajax) and the last ones switch off at 9:30 p.m. (Ajax). Pump hours run longer than the warehouse's, and weekends are shorter. Times are local.

Costco gas bar hours in Ontario
StationMon–FriSatSun
Ajax6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
Ancaster6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
Barrhaven6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
Barrie6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
Brantford6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
C Mississauga6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
East Gwillimbury Business Centre6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 8:30 p.m.
Etobicoke6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
Gloucester6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
Guelph6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
N London6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
N Mississauga6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
N Oshawa6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
Nepean6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
Newmarket6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
Niagara Falls6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
NW Toronto6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
NW Vaughan6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
Orillia6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
Oshawa6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
Peterborough6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
S London6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
Scarborough ON6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
Stoney Creek6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
Sudbury6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
Vaughan6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
Waterloo6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.
Windsor6 a.m. – 9:30 p.m.6 a.m. – 8:30 p.m.6 a.m. – 7:30 p.m.

What else is at Costco warehouses in Ontario

Every Costco gas bar sits in a warehouse parking lot, so a fill-up can share a trip with the rest of the list.

Food court
27 of 28
Pharmacy
27 of 28
Optical
27 of 28
Tire center
27 of 28
Car wash
0 of 28
EV charging
0 of 28

How Costco gas works in Ontario

Bring your card. The pump asks for an active Costco membership card before it starts, at all 28 gas bars in Ontario. Without a membership, a Costco Shop Card loaded with credit works the same way.

Pay by card. The pumps take Mastercard, debit and the Costco Shop Card. There is no cash and no Visa, the reverse of the United States.

Check the price first. Each station sets its own price, usually once a day, so two Costco stations in Ontario can differ. Today the regular average here is 158.4¢. 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.

Ontario prices by city

Provinces near Ontario

Costco gas in Ontario: common questions

Where is the cheapest Costco gas in Ontario today?

N Oshawa posts the lowest Regular price in Ontario, 147.9¢ as of the October 31, 2026 reading — 18.0¢ under S London, the most expensive of the 28 stations reporting. It shares that price with 1 other station.

How many Costco gas stations are there in Ontario?

Ontario has 28 Costco warehouses with a gas station, across 22 cities, and all of them reported a price in the last 30 days.

Which Costco gas stations in Ontario sell diesel?

Diesel is sold at 1 of 28 stations in Ontario. Each station page lists the grades that warehouse has actually posted a price for in the last 30 days.

Is Costco gas cheaper in Ontario than in Canada?

Yes — the average Costco Regular price in Ontario is 158.4¢, 4.3¢ below the Canadian average of 162.7¢ as of the October 31, 2026 reading.

Are Costco gas prices in Ontario going up or down?

Down — the average Costco Regular price in Ontario has eased about 19.4¢ over the past month, from 177.9¢ to 158.4¢.