2025 Boston Marathon Registration Dates. The 2025 boston marathon qualifying window began on september 1, 2023, and will close at 5:00 p.m. 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 129th boston marathon will take place on monday, april 21, 2025. Et on friday, september 13.