Costco Hours: Memorial Day 2015 by Rhonda July 21, 2020 367 Costco will be closed on Monday, May 25, 2015, in observance of Memorial Day. 0 FacebookTwitterPinterestEmail previous post Costco Weekend Update: May 22, 2015 – May 24, 2015 next post Costco Clearance: Mikasa French Countryside Stoneware 20-Piece Dinnerware Set $39.97 You may also like Yardistry 12′ x 14′ Contemporary Gazebo – Costco... Costco Sale: Ninja NeverClog Cold Press Juicer Totally Bamboo Destination Washington Cutting Board at Costco! Costco Unadvertised Sales! APRIL 2024 Costco In-Warehouse Hot Buys Sale: APRIL 2024 Happy Easter!