Trail du Buis takes place in La Buisse, beginning Sunday morning with bib collection for participants. The traditional 21 km race, runnable solo or in pairs, is offered alongside shorter events for runners and Nordic walkers. A 30 km race, new in recent years, is part of the Pays Voironnais Trail Series.
The 21 km course ascends for a significant portion before reaching the Grand Ratz area, then alternates between narrow paths, woodland tracks, rural roads, and challenging terrain. It is suited for those who enjoy mountainous landscapes and benefit from training on inclines and varied surfaces. Over 700 participants typically attend, with about thirty pairs in the 21 km event. The 30 km provides a more demanding choice and serves as the sixth event in the seven-part PVTS series. Nordic walkers utilize a section of the 10 km course when upper paths near Les Combes are impacted by rockfalls.