Boston Marathon 2025 Entry Fee. This does not apply to your fundraising commitment. Registration for the 129th boston marathon, presented by bank of america, the boston athletic association (b.a.a.) begins tomorrow, september 9 and will run for five days, closing on september 13.

Here’s how to register for the 2025 boston marathon and some. For the 2025 boston marathon, the qualifying window began on september 1, 2023 and was open through september 13, 2024.