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Costco Gas Saturday and Sunday Hours. Costco weekend gas hours are usually shorter than they are during the week, but still longer than those at the warehouse. Typically, the weekend open hours begin at between 6 am to 7 am in the morning, and close between 7 pm and 9 pm.
On weekdays Costco gas stations are typically open from 6 a.m. to 8 a.m. (and some even at 5 a.m.), and close between 7 p.m. to 10 p.m. These extended opening hours appeal to everyday commuters that drive to and from work every day, but who only shop at Costco Warehouse once in a while.