Bailleul en Rose begins at Place de l'Eglise in Bailleul-le-Soc, a commune in the Oise department of northern France. It is an October charity race-and-walk day featuring two timed nature runs, over 8 km and 12 km, and two untimed walks, over 4 km and 8 km.
The routes are short but include elevation changes: the 12 km trail climbs 103 metres, while the 8 km trail and 8 km walk each climb 51 metres, and the 4 km walk gains 22 metres. The event raises money for the Oise branch of the League Against Cancer, uniting participants with a common cause, though the trail races and hikes have separate finishes. A snack is provided at the end, and registration covers health-related requirements, including a health prevention course.