Osny Running Races

Foulées osnyssoises is the 30th edition of the town’s multi-distance running meeting, held at Parc de Grouchy in Osny. The programme on Sunday 24 May 2026 includes five races ranging from youth 800 m and 1.5 km events through 5 km, 10 km and a newly introduced 21 km course. The 21 km route is described as a new urban-trail style parcours that crosses neighbourhoods and mixes rural, wooded and urban sections. The event is organised by Entente Agglomération CergyPontoise Athlétisme (EACPA) on behalf of the Ville d’Osny.

Race day runs within a 09:00–12:00 window with the main adult distances (5 km, 10 km and 21 km) scheduled to start at 09:30 and the youth races earlier in the morning. Registration is via ledossard.com (registration open 1 April–22 May) and bib collection is available on Friday 22 May at Decathlon Cergy, Saturday 23 May at the Hôtel de Ville, and from 08:00–09:15 on race day at the Hôtel de Ville. The event includes category prizes and podiums for finishing positions, and the municipal organiser is coordinating safety, signage and logistics around the Parc de Grouchy start/finish. Participants and visitors are advised to consult the official municipal event page and the event PDF for full practical details.