Costco Closed on Labor Day 2019 by Rhonda February 15, 2021 577 9/2/19. Costco will be closed on Monday, September 2, 2019, in observance of Labor Day. 0 FacebookTwitterPinterestEmail previous post Costco – Synergy Kammi Pushback Recliner next post Costco Sale – Klamath Fireplace Mantle You may also like Costco Take & Bake Pizza Sale! Costco Unadvertised Sales! FEBRUARY 2025 Stylish Bar Cabinet at Costco! Costco Coupon Book FEBRUARY 2025 French Fries at Costco? Yes, Please! Costco In-Warehouse HOT BUYS Sale – JANUARY 2025