M-F 5:30am to 9:30pm, Sat 6am to 8pm, and Sun 6am to 7:30pm
You can Google your Costco location and get accurate hours of the station that you are inquiring of. Better to get accurate info than listening to a lot of wrong guestimates.
6 am to 9 pm m -f. Not sure about sat or sun
Seems like Costco Gas is open when the Costco is open
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