Memorial Day, also known as Decoration Day, is an official holiday observed in most states of the United States. It is observed on the last Monday in May; historically it was observed on a fixed date, May 30, until 1971 when it was changed for federal employees. All states adopted the change to the last Monday in May except Louisiana. Memorial Day began after the end of World War I when the day was reserved for honoring the dead of all American wars; it eventually included the deceased relatives and friends, military and civilian. Memorial Day is officially marked by the placing of a wreath at the Tomb of the Unknowns in Arlington National Cemetery.

Montgomery County government will observe this holiday.