Costco Grafton Gas Prices – Port Washington Rd
Today at the pump
Regular3.959
Premium5.099
USD per gallon · Last updated September 15, 2026 · This station does not sell diesel
950 Port Washington Rd, Grafton, WI 53024-9201 · Open in Maps ↗
30-day range
where today sits- Regular$3.959 today · avg $3.775$3.699 low$3.959 high
- Premium$5.099 today · avg $4.911$4.819 low$5.099 high
Price history at Grafton
Last 30 days · USD per gallonRegularPremium
View data as table
| Date | Regular | Premium |
|---|---|---|
| Aug 17 | $3.879 | $4.959 |
| Aug 18 | $3.879 | $4.959 |
| Aug 19 | $3.859 | $4.959 |
| Aug 20 | $3.859 | $4.959 |
| Aug 21 | $3.859 | $4.959 |
| Aug 22 | $3.859 | $4.959 |
| Aug 23 | $3.859 | $4.949 |
| Aug 24 | $3.879 | $4.899 |
| Aug 25 | $3.699 | $4.899 |
| Aug 26 | $3.699 | $4.879 |
| Aug 27 | $3.699 | $4.879 |
| Aug 28 | $3.699 | $4.899 |
| Aug 29 | $3.699 | $4.899 |
| Aug 30 | $3.699 | $4.879 |
| Aug 31 | $3.699 | $4.859 |
| Sep 1 | $3.859 | $4.859 |
| Sep 2 | $3.699 | $4.899 |
| Sep 3 | $3.699 | $4.829 |
| Sep 4 | $3.699 | $4.829 |
| Sep 5 | $3.699 | $4.829 |
| Sep 6 | $3.699 | $4.829 |
| Sep 7 | $3.699 | $4.829 |
| Sep 8 | $3.699 | $4.829 |
| Sep 9 | $3.699 | $4.819 |
| Sep 10 | $3.699 | $4.899 |
| Sep 11 | $3.699 | $4.899 |
| Sep 12 | $3.699 | $4.899 |
| Sep 13 | $3.959 | $5.099 |
| Sep 14 | $3.959 | $5.099 |
| Sep 15 | $3.959 | $5.099 |
Last updated September 15, 2026. Prices are collected once daily and can lag same-day changes at the pump.
Grafton is located at 950 Port Washington Rd, Grafton, WI 53024-9201, in Wisconsin. The gas station sits in the warehouse parking lot and is open to Costco members, selling Regular and Premium — this location does not sell diesel. Gas station hours are 6 a.m. – 10 p.m. on weekdays, 6 a.m. – 8:30 p.m. on Saturdays and 6 a.m. – 7:30 p.m. on Sundays, in local time.
Warehouse
Station details
Grafton Gas station hours
- Mon–Fri
- 6 a.m. – 10 p.m.
- Saturday
- 6 a.m. – 8:30 p.m.
- Sunday
- 6 a.m. – 7:30 p.m.
Grafton Warehouse hours
- Mon–Fri
- 10 a.m. – 8:30 p.m.
- Saturday
- 9:30 a.m. – 7 p.m.
- Sunday
- 10 a.m. – 6 p.m.
Nearby
Costco gas near Grafton
- MiddletonMiddleton, WI · 82.0 mi$3.799Regular
- SchaumburgSchaumburg, IL · 87.9 mi$4.149Regular
- Oak BrookOak Brook, IL · 102.2 mi$4.359Regular
- MerrillvilleMerrillville, IN · 131.4 mi$3.599Regular
Distances are straight-line. Prices across the border are shown in that country’s units (¢ per litre).
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