Boston Marathon 2025 Registration Window 2025. Et on friday, september 13, 2024. Registration details for that race will be announced following the.
The 2025 boston marathon qualifying window began on september 1, 2023, and will close on september 13. In order to register, applicants must submit a valid bq run between september 1, 2023 and the end of registration, which is 5 p.m.