Costco Closed on Labor Day 2019 by Rhonda February 15, 2021 February 15, 2021 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 is Closed on the 4th of July... Sunforce Solar String Lights – Costco Sale! Costco Unadvertised Sales! JULY 2022 Tommy Bahama Solar LED Path Lights – Costco... Ove Decors Broadway 60″ Vanity at Costco! ProKeepers 4-Piece Deli Container Set at Costco!