Chichibu, Saitama Pref., Japan · Saturday, November 14, 2026

Fixed Distance 50K

FunTrails50K Round

72 days away

50 km Distance

2,850 m Climbing

6.8 Grit · Hardcore

35.9915° N, 139.0858° E © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 57 m / km Mountain. Significant climbing. Steep sections will require power hiking.

Time limit 12 hours 14:24 min/km average. Generous. Walkable throughout for most of the field. More forgiving than 69% of 50K races. Measured against 982 races of the same distance. Cut-off calculator →

Field size ~622 Very large. Congested start, busy aid stations.

DUV results for the 2025 edition (50km) — 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 15°C

Night low 4°C

Rainfall Mostly dry

Daylight 10 h 19 m of light

Regional 2001-2020 average for November — NASA POWER, grid elevation 264 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

Gear for this race

Chosen for 50 km of trail with 2,850 m of ascent.

Trail Running Shoes 57 m of climb per kilometre — grip and rock protection before cushioning.
Race Nutrition 50 km of self-supported fuelling between aid stations.
Hydration Vests Pole attachment and chest-strap stability on steep ground.
Trekking Poles 2,850 m of ascent to walk up.
Headlamps A 12 h limit puts you out there after dark.