Memorial Day weekend is one of the biggest holidays for backyard barbecues, road trips, and beach outings. For many of us, it’s also a time to stock up on summer essentials, as so many retailers host Memorial Day sales and offer discounts to celebrate the day.

On a typical day, the big box store opens between 9 a.m. and 10 a.m. (depending on location) and closes around 8:30 pm on weekdays. On Saturday, many Costcos open at 9:30 a.m. and close at 6 p.m. Sundays hours are usually 10 a.m. until 6 p.m. It's recommended that you check with your local store first to be sure they keep these hours.

Costco members who penciled in a Monday in May for a stock-up run will need to rethink their plans. Here's what shoppers need to know