Ultra Running Hub Tramelan, Switzerland · Saturday, September 26, 2026
Fixed Distance 50 mi
Trail du Jura Bernois - La Grandiose
10 days to go
66 km Distance
3,129 m Climbing
8.0 Grit · Hardcore
What the course asks
Climbing rate 47 m / km
Mountain. Significant climbing. Steep sections will require power hiking.
Time limit 13 hours
11:49 min/km average. Generous. Walkable throughout for most of the field. About average for a 50 mi. Measured against 455 races of the same distance. Cut-off calculator →
Field size ~77 Mid-sized. Company early, well spread out by halfway.
DUV results for the 2025 edition (64km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.
Typical conditions, September
Daytime high 18°C
Night low 9°C
Rainfall Mostly dry
Daylight 12 h 02 m of light
Regional 2001-2020 average for September — NASA POWER, grid elevation 782 m. Not a forecast.
The Aid Station
Course-specific beta from the community
This is a mountain course. Poles are highly recommended for the sustained climbs.
With trail terrain, choose a shoe with moderate cushioning for optimal performance.
Gear for this race
Chosen for 66 km of trail with 3,129 m of ascent.
- Trail Running Shoes47 m of climb per kilometre — grip and rock protection before cushioning.
- Race Nutrition66 km of self-supported fuelling between aid stations.
- Hydration VestsPole attachment and chest-strap stability on steep ground.
- Trekking Poles3,129 m of ascent to walk up.
- HeadlampsA 13 h limit puts you out there after dark.
Course Notes
Tramelan, Cortébert, Mont-Sujet, Lamboing, Chasseral, Combe-Grède-Tals, St-Imier-Tals, Windpark Mont-Crosin, Tramelan.
Similar races
Other 50 mi trail ultras, closest in distance first.