2025 OSJ Shinshiro Trail 32K & Double 64K

The 2025 OSJ Shinshiro Trail 32K & Double 64K is a trail-running event held in Shinshiro City, Aichi Prefecture, Japan. It is part of the OSJ Trail Running Series and features two main races: a 32K and a Double 64K (two laps of the 32K course). The event emphasizes connecting runners with the region’s natural beauty and promoting outdoor sports tourism.

Date & Location

• Date: March 22–23, 2025 (registration on March 22, races on March 23).

Start Times:

• 32K: 8:00 AM.
• Double 64K: 7:00 AM.
• Location: Shinshiro City, Aichi Prefecture, Japan.

Course Specifications

32K:

• Distance: 30 km (ITRA-certified).
• Elevation Gain/Loss: +2,570m / -2,580m.
• Terrain: 9% paths, 90% tracks, 1% roads.

Double 64K:

• Distance: 61 km (two laps of the 32K course).
• Elevation Gain/Loss: +5,270m / -5,280m.

Time Limits & Cutoffs

• 32K: 10 hours.
• Double 64K: 11 hours.

Course Records & Median Times

• 32K: CR: 3:49:12. Median Time: ~4:30–5:00 hours (based on past results).
• Double 64K: CR: 8:38:02 (2024, Men 20-34). Median Time: ~9:30–10:30 hours (based on past results).

Weather & Challenges

• Typical Conditions: March in Shinshiro City is cool, with average temperatures ranging from 5°C to 15°C. Rain is possible, and wind can be a factor in mountainous areas.

Weather-Related Challenges:

• Rain: Slippery trails and reduced visibility.
• Wind: Exposure on higher elevations can increase fatigue.
• Temperature Fluctuations: Layering is essential to manage body temperature.

Equipment & Indispensable Gear

• Mandatory: Mobile phone, Collapsible cup (no disposable cups at aid stations).
• Recommended: Hydration system (500ml+ capacity), rain jacket, whistle, compass, survival sheet, snacks, and energy gels for sustained performance.

Critical Mental Challenges

• Elevation Gain: The steep climbs and descents can be mentally taxing, especially in the Double 64K.
• Isolation: Long stretches of trails with limited support can test mental resilience.
• Time Pressure: Meeting cutoff times while managing fatigue requires focus and determination.

Training Tips

• Hill Training: Incorporate hill repeats and long runs with elevation gain to build strength.
• Endurance: Focus on back-to-back long runs to simulate race-day fatigue.
• Terrain-Specific Training: Practice on trails with similar terrain (tracks and paths) to adapt to the course.

Cruxes of the Race

• Steep Climbs: The elevation gain in both races is significant, with the Double 64K requiring double the effort.
• Technical Sections: Rocky and uneven terrain can slow progress and increase fatigue.
• Aid Station Gaps: Plan hydration and nutrition carefully, as aid stations are spaced apart.

For more details, visit the official race pages or ITRA event listing