Costco Gas Prices in Wisconsin
- Regular avg
- $4.065▼ −$0.018
- Premium avg
- $5.015▼ −$0.020
- Diesel avg
- $5.899
- Stations reporting
- 12
Avg of 12 stations · per gallon · ▲▼ change since the previous day
Average price history in Wisconsin
Last 30 days · per gallonRegular: $3.963 on Oct 2 to $4.065 on Oct 31, low $3.937, high $4.187. Premium: $4.984 on Oct 2 to $5.015 on Oct 31, low $4.922, high $5.182. Diesel: $6.059 on Oct 2 to $5.899 on Oct 31, low $5.824, high $6.059.
Costco gas in Wisconsin today
Costco gas stations in Wisconsin include 12 warehouses across 12 cities.
Today’s Regular prices span $0.580 across the 12 stations reporting, from the cheapest to the most expensive.
Costco Regular prices in Wisconsin have climbed about $0.102 over the past month, from $3.963 a month ago.
The furthest any single station moved was Grafton, up $0.280.
- Cheapest today
- Eau Claire — $3.899
- Most expensive today
- Grafton — $4.479
- vs the US average
- $0.210 below, at $4.275
- Diesel
- sold at 2 of 12 stations
- Weekday opening
- 6 a.m. at all 12 stations
- Newest warehouse
- Oconomowoc — August 2026
- Oldest warehouse
- Grafton — August 2007
Wisconsin stations by price
Cheapest first — page through to see more.
| Rank | Station | Location | Regular today |
|---|---|---|---|
| 1 | Eau ClaireEau Claire | Eau Claire | $3.899 |
| 2 | Grand ChuteGrand Chute | Grand Chute | $3.989 |
| 3 | MiddletonMiddleton | Middleton | $3.999 |
| 4 | Sun PrairieSun Prairie | Sun Prairie | $3.999 |
| 5 | Pleasant PrairiePleasant Prairie | Pleasant Prairie | $3.999 |
| 6 | Menomonee FallsMenomonee Falls | Menomonee Falls | $3.999 |
| 7 | VeronaVerona | Verona | $3.999 |
| 8 | PewaukeePewaukee | Pewaukee | $4.049 |
| 9 | OconomowocOconomowoc | Oconomowoc | $4.089 |
| 10 | New BerlinNew Berlin | New Berlin | $4.099 |
| 11 | BellevueBellevue | Bellevue | $4.179 |
| 12 | GraftonGrafton | Grafton | $4.479 |
Fuel grades at Costco in Wisconsin
All 12 Costco gas stations in Wisconsin sell Kirkland Signature fuel, which is Top Tier certified. Diesel is sold at 2 of the 12.
| Grade | Stations | Avg today | Cheapest |
|---|---|---|---|
| Regular | 12 | $4.065 | Eau Claire $3.899 |
| Premium | 12 | $5.015 | Pewaukee $4.849 |
| Diesel | 2 | $5.899 | Menomonee Falls $5.899 |
Regular
all 12 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 12 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
2 of 12 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 Wisconsin good quality?
Costco does not sell a refiner’s brand. Every pump in Wisconsin 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 Wisconsin
On weekdays the earliest pumps in Wisconsin come on at 6 a.m. (Bellevue) and the last ones switch off at 10 p.m. (Bellevue). Pump hours run longer than the warehouse's, and weekends are shorter. Times are local.
| Station | Mon–Fri | Sat | Sun |
|---|---|---|---|
| Bellevue | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Eau Claire | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Grafton | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Grand Chute | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Menomonee Falls | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Middleton | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| New Berlin | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Oconomowoc | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Pewaukee | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Pleasant Prairie | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Sun Prairie | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| Verona | 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 Wisconsin
Every Costco gas station sits in a warehouse parking lot, so a fill-up can share a trip with the rest of the list.
- Food court
- 12 of 12
- Pharmacy
- 12 of 12
- Optical
- 12 of 12
- Tire center
- 12 of 12
- Car wash
- 0 of 12
- EV charging
- 0 of 12
How Costco gas works in Wisconsin
Bring your card. The pump asks for an active Costco membership card before it starts, at all 12 gas stations in Wisconsin. 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 Wisconsin can differ. Today the regular average here is $4.065. 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.
Wisconsin prices by city
- Bellevue · 1 station$4.179
- Eau Claire · 1 station$3.899
- Grafton · 1 station$4.479
- Grand Chute · 1 station$3.989
- Menomonee Falls · 1 station$3.999
- Middleton · 1 station$3.999
- New Berlin · 1 station$4.099
- Oconomowoc · 1 station$4.089
- Pewaukee · 1 station$4.049
- Pleasant Prairie · 1 station$3.999
- Sun Prairie · 1 station$3.999
- Verona · 1 station$3.999
States near Wisconsin
- Costco gas prices Illinois · 24 stations$4.625
- Costco gas prices Iowa · 4 stations$3.842
- Costco gas prices Michigan · 18 stations$4.385
- Costco gas prices Minnesota · 15 stations$3.976
- Costco gas prices Indiana · 9 stations$3.719
- Costco gas prices Ohio · 13 stations$3.912
Costco gas in Wisconsin: common questions
Where is the cheapest Costco gas in Wisconsin today?
Eau Claire posts the lowest Regular price in Wisconsin, $3.899 as of the October 31, 2026 reading — $0.580 under Grafton, the most expensive of the 12 stations reporting.
How many Costco gas stations are there in Wisconsin?
Wisconsin has 12 Costco warehouses with a gas station, across 12 cities, and all of them reported a price in the last 30 days.
Which Costco gas stations in Wisconsin sell diesel?
Diesel is sold at 2 of 12 stations in Wisconsin. Each station page lists the grades that warehouse has actually posted a price for in the last 30 days.
Is Costco gas cheaper in Wisconsin than in the US?
Yes — the average Costco Regular price in Wisconsin is $4.065, $0.210 below the US average of $4.275 as of the October 31, 2026 reading.
Are Costco gas prices in Wisconsin going up or down?
Up — the average Costco Regular price in Wisconsin has climbed about $0.102 over the past month, from $3.963 to $4.065.
What time do Costco gas stations in Wisconsin open?
The pumps open at 6 a.m. on weekdays at all 12 stations, ahead of the warehouse doors. Each station page carries its own full week, in local time.