Races
Okushinano
Japan, June. 100 km on 75% trail. +22,717 ft of climbing. 21 hours cutoff.
- Start1,926 ft
- High5,583 ft
- Low1,255 ft
- Finish1,906 ft
- Japan at mile 0.0
- Okushinano mile 12 at mile 12, cutoff 4.2 hours
- Okushinano mile 25 at mile 25, cutoff 8.4 hours
- Okushinano mile 37 at mile 37, cutoff 12.6 hours
- Okushinano mile 50 at mile 50, cutoff 16.8 hours
- Finish Japan at mile 62, cutoff 21 hours
Geometrycourse math
The cruxHumid climbs, ridge exposure, and aid gaps in remote terrain (near mile 40)
Course DNA
The Course
Okushinano runs 100 km through Japan. +22,717 ft gain and -22,736 ft loss. Surfaces skew 75% trail / 20% dirt road / 5% paved. Humid climbs, ridge exposure, and aid gaps in remote terrain. High point near 5,614 ft. Low near 1,207 ft. June temps run 50°F to 85°F. The course rewards patience early and punishes rushed descents after mile 31.
The Work
Train for 22,717 feet of climbing across 100 km. Back-to-back long runs on trail. Practice power-hiking grades above 15 percent. 21 hours total means limited margin: rehearse fueling every 45 to 60 minutes and downhill eccentric work weekly. Technicality 5/10. Build a block that simulates the crux near mile 40.
Kit
June in Japan: plan for 50°F to 85°F. Mandatory shell if rain is in forecast. Headlamp with spare batteries if 21 hours pushes past dark. Poles help on sustained climbs above mile 16. Vest capacity for 2 liters minimum. Shoes matched to 75% trail: lugs for mud, rock plate if the course turns technical after mile 31.
Race Day
Hold effort through mile 16. The field often splits on the first big climb after mile 31. Humid climbs, ridge exposure, and aid gaps in remote terrain near mile 40 is where time is won or lost. Walk the steep pinches. Run the flats and gentle downhills. Crew at major aids: socks, calories, ice if hot. Transitions under 5 minutes when possible. Final third is 21 miles of fatigue management. Finish with reserve for the last descent.
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