Trail SO Bugey is a trail-running event held in Lhuis, a village in the Ain department of eastern France. The race takes place in May, with the objective to run off-road while experiencing the Bugey area up close.
The event is in its early years, with the upcoming running marking the tenth edition. The official tone is local and community-organized, with organizers clearly acknowledging runners, volunteers, and partners. The event's motto summarizes its appeal: conviviality, pleasure, and beautiful landscapes.