London Big Half Marathon 2025 Registration. In 2024, it began at 08:25 with the elite wheelchair race, followed by the elite men and women and the first mass wave at 08:30. We have 15 places for 2025, offered and filled on a first come first serve basis.
The big half will take place on sunday 7 september 2025. The big half is organised by the london marathon team and is a one day even running festival with options for runners of all capabilities, celebrating cultural diversity in london.