TransJeju 20K (Jeju, Korea) 2026
Also known as: Jeju20K
A loop starting and finishing in Gasiri village in eastern Jeju, running over the village's oreum (small volcanic cones), grassland and farmland.
The course tops out at 466 m (low point 214 m). About 70% of the distance is gentle (under 5% grade), so there is a lot of running. In 2025, 96% of starters finished. The median finish was about 3 h.
Predict your finish from your ITRA index
Enter your ITRA performance index to get your finish time, aid-station splits and cutoff margins from the results of 60 finishers of this race — the same model as the TRAIL STATUS app. Nothing is saved or sent.
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Predict in detail from my Strava trainingOverview
- Date
- Sat, 3 Oct 2026
- Start
- 10:00
- Location
- South Korea
- Distance
- 20 km
- Elevation gain
- 508 m
- Time limit
- 4h
- ITRA
- H
- Official website
- transjeju.utmb.world/races/Jeju20K
Elevation profile
Aid stations and cutoffs
| # | Distance | Aid station | Segment | Cutoff |
|---|---|---|---|---|
| 1 | 12.1 km | Deer Mountain | 12.1 km | Day 1 12:202h 20m |
| F | 20 km | FINISH | 7.9 km | Day 1 14:004h |
The small figure under each cutoff is the time from the start. Day 1 is the day of the start.
2025 results
1,662 starters, 1,588 finishers (95.5% finish rate). Finish times of those who finished:
- Fastest
- 1h 33m
- Top 10%
- 2h 24m
- Top 25%
- 2h 46m
- Median
- 3h 10m
- Top 75%
- 3h 34m
- Top 90%
- 3h 48m
- Last finisher
- 4h 1m
"Top 25%" means one in four finishers had crossed the line by this time.
Years with a different course or different cutoffs are not directly comparable.
Other races
- TransJeju 100K (Jeju, Korea) 2026Sat, 3 Oct 2026 · South Korea · 104 km
- TransJeju 100M (Jeju, Korea) 2026Fri, 2 Oct 2026 · South Korea · 148 km
- TransJeju 60K (Jeju, Korea) 2026Sat, 3 Oct 2026 · South Korea · 60 km
- UTGD Skyrace 42 Sky Marathon 2026Sun, 14 Jun 2026 · South Korea · 42.2 km
- ULJU TRAIL NINE PEAKS 9 PEAKS 125K (Ulju, Korea) 2026Fri, 30 Oct 2026 · South Korea · 124.9 km
From your training log, TRAIL STATUS estimates your finish time, aid-station splits and cutoff margins for this race.
Predict my raceCompiled from each race's official information. Details can change, so always check the race's official website for the latest. Spotted a mistake? Please tell us through the contact form.
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