Costco – Memorial Day 2021 by Rhonda June 2, 2021 809 5/31/21. Costco will be closed on Monday, May 31, 2021, in observance of Memorial Day. We are extremely grateful for those military men and women who have sacrificed their lives in service of our country. 0 FacebookTwitterPinterestEmail previous post Step 2 Double Showers Splash Water Table – Costco Sale! next post Whalen Industrial Metal and Wood Workbench – Costco Sale! You may also like Costco Weekend Update: April 25-27, 2025 Costco Weekend Update: April 18-20, 2025 Kirkland Signature Baby Wipes – Costco Sale! Strawberry Streusel Cheesecake at Costco! Yankee Candle Car Jar Ultimate Air Fresheners –... Costco Coupon Book APRIL 2025