Seoul 100K
Location
Seoul
South Korea
Distance
100K Ultra
Date
September 20, 2026
in 14 days
Typical WeatherSeptember, 19-27°C (66-81°F), usually mild
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An ultra trail race that starts in Bukhansan National Park and crosses Seoul's mountains and city streets, blending nature with the capital's urban core.
What Makes This Race Special
- Starts in Bukhansan National Park
- Crosses Seoul's mountain trails and streets
- Also offers 51.5K and 23.4K distances
- International-entrant registration lane