Collontrek

The 2025 Collontrek confirmed the format of the international mountain race connecting the Place-Moulin dam in Bionaz, Valpelline, with Arolla, in the Swiss Canton of Valais. Participants tackled the 22 kilometers of the course and the 1250 meters of positive elevation gain by crossing the Col Collon at 3080 meters, traversing alpine paths, glacier, and mule tracks.

The race, part of the Tour du Cervin and Tour des Grands Barrages circuits, renewed the sporting and cultural link between Italy and Switzerland along the ancient border trails, in one of the most evocative high-mountain landscapes of the Aosta Valley.

The 2025 edition re-proposed the classic route of approximately 22 km and 1250 m D+ with a start from the Place-Moulin dam (1989 m) in Bionaz, crossing the Col Collon (3080 m) with glacier traverse, and finishing in Arolla (2006 m) in Switzerland, within the Tour du Cervin and Tour des Grands Barrages circuits.