Ultra Running Hub Yonohara, Okinawa Pref., Japan · Sunday, December 20, 2026
Fixed Distance 100K
Okinawa 100km Ultramarathon
108 days away
100 km Distance
not publishedn/a Climbing
5.0 est Grit · Challenging
Calculated from 100 km alone — the organiser has not published an elevation profile. Read 5.0 as a floor, not a verdict.
What the course asks
Time limit 14 hours
8:24 min/km average. Comfortable. Room to walk the climbs and stop at aid. Climbing is unpublished, so this pace is a ceiling on the effort, not a measure of it. Tighter than 85% of 100K races. Measured against 203 races of the same distance. Cut-off calculator →
Field size ~620 Very large. Congested start, busy aid stations.
DUV results for the 2025 edition (100km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.
Typical conditions, December
Daylight 9 h 42 m of light
The Aid Station
Course-specific beta from the community
With trail terrain, choose a shoe with moderate cushioning for optimal performance.
For 100km+ efforts, prioritize real food at aid stations to prevent palate fatigue.
Gear for this race
Chosen for 100 km of trail.
- Trail Running Shoes 100 km of trail — cushioning that is still there in the last quarter.
- Race Nutrition Past 100 km the palate quits before the legs do — carry more than one flavour.
- Hydration Vests Flask capacity for 100 km, without the bounce.
- Headlamps A 14 h limit puts you out there after dark.
- Accessories Chafe and blisters end more 100 km races than fitness does.
Course Notes
Yona Furamahama Park, out-and-back course
Similar races
Other 100K trail ultras, closest in distance first.