Le 12 du Dolaizon is a 12.0 km trail race of Trail du Saint-Jacques by UTMB 2026 in Le Puy-en-Velay, France. The race starts on June 14, 2026.
The course climbs 210 m+, between a low point of 629 m and a high point of 913 m. With 18 m/km of climbing, the course is predominantly runnable. By gradient, 18% of the distance is uphill, 43% downhill and 39% flat. The longest climb runs 0.7 km at an average 10.4% grade (72 m of vertical). The longest descent runs 2.2 km at 5.9% (130 m of vertical). The steepest climb averages 13.5% over 0.6 km. The steepest descent drops at 23.1% over 0.2 km. Surface: 57% trail, 22% road, and 17% smooth. Flat-equivalent effort: 12.7 FlatKM.
The course is runnable enough that trekking poles are not needed.
Historically on race day, start temperatures range from 11°C to 21°C, around 15°C at the highest point; the chance of precipitation is about 38%.
This page has the interactive elevation profile, gradient matrix, pacing and nutrition planner and weather climatology for Le 12 du Dolaizon.
Other distances of Trail du Saint-Jacques by UTMB 2026Ultra du Saint-Jacques (134 km)·Grand Trail du Saint-Jacques (81.0 km)·Monistrail (54.0 km)·Les Chibottes (28.0 km)
Official websitetsj.utmb.world
