Attention U.S. shoppers: Costco confirms store closures across the country on May 26

Costco, one of the biggest supermarkets across the United States, is making headlines this May. The well-known warehouse club has announced changes that will temporarily alter the store's operating hours.

Shoppers across the U.S. should take note as it is an unexpected alteration occurring on a major holiday, which may affect regular shopping habits. Additional details expected to follow soon.

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Costco announces stores closing on May 26

Costco, a well known warehouse club chain engaged in the membership-only club industry, has indicated it will close all US locations for one day this May.

The closure is happening on Memorial Day, May 26, in accordance with the retailer's practice of closing on other major holidays.

The company began as Price Club, opening its first store at Morena Boulevard in San Diego in 1976, and is now estimating more than 600 stores in the United States. Among all states, California has the most Costco stores at 142 -- roughly 23% of all U.S. Costco stores, according to ScrapeHero.

If you plan to visit one of those stores on your day off in May, you are going to have to reschedule your trip.

The retailer has announced it will close all of its U.S. stores for the day on Memorial Day (May 26 this year). This type of closure for one of the largest membership-only warehouse retailers is in line with the retailers' logic of closing down stores on major holidays such as Labor Day, Thanksgiving, and Christmas.

So if you loosely plan on stocking up for a Memorial Day barbecue or gathering, plan ahead to shop earlier in the holiday weekend.

What is Memorial Day in the United States?

Memorial Day is a federal holiday to honor and mourn military personnel who have died while serving in the United States Armed Forces, as the Wounded Warrior Project and National Cemetery Administration note.

Memorial Day is observed every year on the last Monday in May and is the nation's premier day of honoring and remembering fallen service members.

Costco describes itself as a membership warehouse club dedicated to providing its members with the lowest possible prices on quality, brand-name, and products.

The company operates hundreds of stores worldwide and sells a large variety of merchandise with specialty departments and exclusive member services to enhance the shopping experience for its members.