Boston Marathon 2025 Qualifying Window Time. 2025 | 2024 | 2023. The boston marathon registration window for the 2025 boston marathon opens on september 1, 2023, and closes on september 13, 2024.
The qualification window for the 2026 boston marathon opened on 1st september 2024 and runs through to the end of the registration week in september 2025. Boston marathon qualifying times for 2026.