Memorial Day is observed on the last Monday in May because federal law changed its observance to a Monday under the Uniform Monday Holiday Act, effective in 1971. Earlier observances were associated with May 30.
The purpose of a Monday holiday
Moving several federal holidays to designated Mondays created predictable three-day weekends for many workers. The convenience of a long weekend is part of the calendar story, but it should not overshadow Memorial Day’s commemorative meaning.
How to find next year’s date
Open the May calendar and look at the final Monday. For 2027, it is May 31; for 2028, it is May 29. There is no need to count a fixed number of days from Easter or from the previous Memorial Day.
Does the date ever leave May?
No. Under the current U.S. rule, Memorial Day always falls in May. Its possible dates are May 25, 26, 27, 28, 29, 30 or 31.
Does every business take the day off?
No. It is a federal holiday, but private-sector operations, retail locations and services may open. People planning travel should confirm individual hours and local events.
Frequently asked question
Was Memorial Day originally May 30?
Yes. A May 30 remembrance date preceded the Monday observance used in the modern federal calendar.
Source and further reading
Reference: U.S. Office of Personnel Management.

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