The central component of the keyword term is the proper noun "Patriots' Day." The other words in the phrase function as interrogatives ("what day is") and modifiers ("2025," "massachusetts") that specify the precise information being sought about this central subject. Therefore, understanding the query revolves around defining the specific instance of this proper noun.
In Massachusetts, Patriots' Day is legally observed on the third Monday in April. For the year 2025, the third Monday of April is April 21. The holiday commemorates the anniversary of the Battles of Lexington and Concord, the first armed conflicts of the American Revolutionary War, which took place on April 19, 1775.
The practical application of this date is significant, as the Boston Marathon is traditionally held on Patriots' Day. Consequently, Monday, April 21, 2025, will be the date of the 129th Boston Marathon. This public holiday also results in the closure of state, county, and municipal offices, as well as public schools and many private businesses throughout the state.
