The central subject of the query, "Patriots' Day," functions as a proper noun. In Massachusetts, this state holiday is legally observed on the third Monday in April. For the year 2025, Patriots' Day will occur on Monday, April 21, 2025.
This observance commemorates the anniversary of the Battles of Lexington and Concord, the initial armed conflicts of the American Revolutionary War, which took place on April 19, 1775. While the historical anniversary is April 19, the Commonwealth of Massachusetts shifted the official observance to the third Monday of the month in 1969. This change was implemented to create a three-day weekend for workers and students. The holiday is also officially recognized in Maine.
The practical application of this date means that on April 21, 2025, state, county, and many municipal government offices and public schools in Massachusetts will be closed. The day is most widely known for hosting the annual Boston Marathon, which is traditionally run on Patriots' Day. Therefore, the 129th Boston Marathon is scheduled to take place on Monday, April 21, 2025.
