Memorial Day, United States postal service
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Memorial Day, observed on the last Monday of May, honors fallen US military members. Banks and government offices close, but most grocery stores like Walmart and Kroger stay open with varied hours. Post offices,
Costco announced it would close all 617 stores across the United States on Monday, May 26, 2025, in observance of Memorial Day. The decision echoes its long-standing policy of closing for major federal holidays.