Costco store hours are found by using the store locator on its website, Costco.com, as of 2015. Many stores are open 10:00 a.m. to 8:30 p.m. Monday through Friday, 9:30 a.m. to 6:00 p.m. on Saturday, and 10:00 a.m. to 6:00 p.m. on Sunday.
Store hours can vary by location. Individual store hours are found by clicking Warehouse Locations on the home page, typing the ZIP code on the next page and clicking Find. A list of the five nearest locations is displayed with store hours. Clicking Store Details displays hours of operations for specific departments in the store. The phone number and physical address are also displayed.