Boston Marathon 2025 Registration Window. The 2025 boston marathon qualifying window began on september 1, 2023, and closed at 5:00 p.m. The boston marathon registration window for the 2025 boston marathon opens on september 1, 2023, and closes on september 13, 2024.

For the 2025 boston marathon, the qualifying window began on september 1, 2023 and was open through september 13, 2024. You’ll learn about the qualifying standards, how to plan your race schedule to meet.