Semi-Marathon Boulogne Billancourt 2026

Approximately 12,000 runners start the 21.097 km road race in Boulogne-Billancourt each November. This event, with over two dozen editions held, is a fixture on the Ile-de-France running calendar, attracting many participants aiming for a personal best. The course winds through the streets of Boulogne-Billancourt, a commune west of Paris, avoiding trails and park paths. Runner feedback indicates well-supplied aid stations and an environment supportive of both novice half marathoners and experienced competitors. The large number of participants creates a significant event atmosphere, distinct from smaller local races.