When Does The Boston Marathon Start 2025. The baa publishes the boston marathon qualifying standards every year along with other information such as the cutoff times, when the qualifying window opens and closes,. The 2025 boston marathon is set to take place on monday, april 21st, 2025.
Et on friday, september 13. For the 2025 boston marathon, the qualifying window began on september 1, 2023 and was open through september 13, 2024.