Ultra Running Hub Tsunan, Niigata Pref., Japan · Sunday, July 5, 2026
Fixed Distance 50 mi
Naeba-Sanroku Geopark Tsunan Ultramarathon 64K
Race completed
64 km Distance
1,800 m Climbing
5.9 Grit · Challenging
What the course asks
Climbing rate 28 m / km
Rolling. Moderate undulations. Requires consistent effort across varying grades.
Time limit 12 hours
11:15 min/km average. Generous. Walkable throughout for most of the field. About average for a 50 mi. Measured against 445 races of the same distance. Cut-off calculator →
Field size ~68 Mid-sized. Company early, well spread out by halfway.
DUV results for the 2026 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, July
Daytime high 26°C
Night low 17°C
Rainfall Wet — expect rain
Daylight 14 h 38 m of light
Regional 2001-2020 average for July — NASA POWER, grid elevation 784 m. Not a forecast.
The Aid Station
Course-specific beta from the community
This is a rolling course. Expect fast, runnable sections where rhythm is key.
With road terrain, choose a shoe with moderate cushioning for optimal performance.
Gear for this race
Chosen for 64 km of road with 1,800 m of ascent.
- Trail Running Shoes 28 m of climb per kilometre — grip and rock protection before cushioning.
- Race Nutrition 64 km of self-supported fuelling between aid stations.
- Hydration Vests Pole attachment and chest-strap stability on steep ground.
- Trekking Poles 1,800 m of ascent to walk up.
- Headlamps A 12 h limit puts you out there after dark.