La Terrible 23km
- When
- Sat, Apr 18, 2026, 4:00 AM
- Where
- Fontenais, CH
- Distances
- 10K · 15K · Marathon · Ultra Marathon
- Terrain
- TRAIL
- Elevation gain
- 4990 m
- Typical weather
- Cool
- Organizer
- Club d’Athlétisme de Fontenais
About
The flagship 106 km is run over two days (18–19 April 2026) by combining the 36 km Trail de Pietchiesson + 70 km Trail de Calabri for about 4,990 m D+; it’s organized by the volunteer team behind Les Courses du Mont-Terrible / Club d’Athlétisme de Fontenais in Fontenais, Canton of Jura, Switzerland.