Washington Costco Gas Prices

Costco operates 33 fuel centers in Washington across 32 cities, with the largest cluster in Spokane (2 stations). Across the state, regular gas averages $5.360, premium runs about $0.52 higher at $5.881, and diesel sits at $6.483. The lowest-priced regular pump is at Costco Clarkston in Clarkston at $4.599, while Sequim in Sequim sits about $1.00 higher. Across the state, regular pump prices have climbed about $0.23 over the past two weeks, from $5.127 two weeks ago. Premium has climbed about $0.26 and diesel has eased about $0.10 over the same period. Diesel is sold at 12 of the 33 Washington locations.