When Is The Boston Marathon 2024. Registration for the 129th boston marathon will open on monday, september 9 at 10:00 a.m. The maximum gradient on the route will be 13.5%.
As the presenting sponsor, bank of america continues to ensure the stability of the world’s oldest annual marathon. For the 2025 boston marathon, the qualifying window began on september 1, 2023 and is open through september 13, 2024.