Boston Marathon 2025 Registration Dates And Locations. The boston athletic association (baa) has announced the registration dates for the 2025 boston marathon. As registration for the 2025 edition of the boston marathon approaches, the boston athletic association (b.a.a.) has issued a timely reminder for athletes to prepare for.
Registration for the 129 th boston marathon will begin on september 9 and continue through september 13, the boston athletic association (b.a.a.) announced on june 3. The field size for the 129th boston marathon, to be run on monday, april 21, 2025, will be 30,000 participants.