when is the boston marathon

The Boston Marathon is traditionally held on Patriots' Day, which is the third Monday in April. The 2025 Boston Marathon took place on Monday, April 21, 2025. This is the 129th edition of the event, which follows the historic tradition of taking place on Patriots' Day in Massachusetts. For the coming years, the marathon dates continue on the third Monday of April: April 20, 2026; April 19, 2027; April 17, 2028, and so forth.