Costco Gas in Grafton, WI
1 station in Grafton, WI
Costco Gas Hours in Grafton
Grafton has 1 Costco gas station. Weekday hours are typically 6 AM to 10 PM. Sunday hours are 6 AM–7:30 PM. Membership is required at the pump. Costco gas is TOP TIER™ certified, meeting enhanced detergent standards recommended by most major automakers.
Hours last checked August 20, 2026. How we check
Costco gas in Grafton: FAQ
How many Costco gas stations are in Grafton, WI?
Grafton has 1 Costco gas station: 950 North Port Washington Road.
What time does Costco gas open in Grafton?
On weekdays, Costco gas in Grafton opens at 6 AM and closes at 10 PM. Hours last checked August 20, 2026.
What are Costco gas hours on Sunday in Grafton?
On Sundays, Costco gas in Grafton is open 6 AM–7:30 PM.
Do I need a membership to buy Costco gas in Grafton?
Yes. An active Costco membership is required at the pump.