Koshu, Yamanashi Pref., Japan · Sunday, November 8, 2026

Fixed Distance 100K

Koshu Alps Haute Route Challenge Klesa 108

66 days away

108 km Distance

5,905 m Climbing

10.0 Grit · Elite / extreme

35.7044° N, 138.7294° E © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 55 m / km Mountain. Significant climbing. Steep sections will require power hiking.

Time limit 16 hours 8:53 min/km average. Comfortable. Room to walk the climbs and stop at aid. Tighter than 72% of 100K races. Measured against 203 races of the same distance. Cut-off calculator →

Field size ~18 Tiny. You will run alone for most of it.

DUV results for the 2025 edition (108km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, November

Daytime high 13°C

Night low 3°C

Rainfall Mostly dry

Daylight 10 h 31 m of light

Regional 2001-2020 average for November — NASA POWER, grid elevation 732 m. Not a forecast.

The Aid Station

Course-specific beta from the community

⛰️ terrain

This is a mountain course. Poles are highly recommended for the sustained climbs.

By UltraHub Expert

👟 gear

With trail terrain, choose a shoe with moderate cushioning for optimal performance.

By UltraHub Expert

🥤 nutrition

For 100km+ efforts, prioritize real food at aid stations to prevent palate fatigue.

By UltraHub Expert

Gear for this race

Chosen for 108 km of trail with 5,905 m of ascent.

Trail Running Shoes 55 m of climb per kilometre — grip and rock protection before cushioning.
Race Nutrition Past 108 km the palate quits before the legs do — carry more than one flavour.
Hydration Vests Pole attachment and chest-strap stability on steep ground.
Trekking Poles 5,905 m of ascent to walk up.
Headlamps A 16 h limit puts you out there after dark.