Costco gas station hours vary by location, but they typically open before and close after the store locations. Members can use various websites, like Priceviewer, to verify the hours of operation for both the store and the gas stations of all Costco locations in their state.
Store and gas station hours may change throughout the year, particularly during holiday seasons. Hours also typically vary by day, with the gas station and store typically being open longer Monday through Friday. It is important to call the local Costco store and verify exact hours that they are open on a particular day. Costco is ranked as a Top Tier gas retailer, as of 2014, according to Costco.com.