Costco Closed on Labor Day 2019 by Rhonda February 15, 2021 640 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 Coupon Book APRIL 2025 Costco Business Center Coupon Book: APRIL / MAY... Costco Hot Buys Sale: 3/29/25 – 4/6/25 Permasteel 46″ Rolling Work Bench at Costco! Bond Bloomington Cascading Cup Fountain at Costco! Costco Unadvertised Sales! MARCH 2025