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TransJeju by UTMB
148km148100km10070km70

Jeju 70K

UTMB World Series
70.0km
October 2
Jeju,
South Korea
utmb·source

Race Pace Calculator · GPX Analyzer · Trail Finder

Other races: South Korea

Read

  • Types of Runs and What Each Workout Actually Trains
  • Hill Training for Trail Runners: Train the Descents
  • Downhill Running Muscle Damage: Why Descents Wreck Quads

Jeju 70K · Race profile

Distance
70.0km
FlatKM
73.6
Max
751m
Min
61m

About Jeju 70K

Jeju 70K is the 70.0km ultra trail at TransJeju by UTMB 2025 (Jeju, South Korea). The race starts on October 2, 2025.

Race strategy

Run easy on the first mountain, then go all out on the second.

  • The finish is runnable. Save your legs to run it all the way.
  • Long race. Control your HR and effort. Early mistakes cost the most.
  • Ease into the early runnable section, then run your race pace.
  • Start · 0.0km–1.7km · Race-day nerves push your heart rate up: don't follow the crowd, find your own rhythm.
  • Settle in · 1.7km–32.2km · Plus 1 more climb. Ease in: hold back more than feels necessary. The race is still ahead. Climb by heart rate or breathing, not pace. Running pays off here: run wherever you can.
  • Fade · 32.2km–53.1km · Descent of 292m averaging 5%, high point 751m. Plus 1 more climb and 1 descent. Your energy fades, and that's normal: hold a steady effort and stop counting the miles. Climb by heart rate or breathing, not pace. Your heart rate drifts down on its own: don't chase your early-race numbers, go by feel.
  • Home · 53.1km–61.4km · 8.3km of runnable trail. No heroics: settle back into your own effort and hold it to the line. Running pays off here: run wherever you can.

Course

By gradient, 35% of the distance is uphill, 37% downhill and 28% flat. The longest climb runs 3.6km at an average 7.4% grade (264m of vertical). The longest descent runs 11.4km at an average 5.6% grade (639m of vertical). The steepest climb averages 21.0% over 0.3km. The steepest descent drops at 15.9% over 0.7km. Surface: 56% trail, 26% road, and 8% smooth. Flat-equivalent effort: 73.6 FlatKM.

Poles

Poles bring little benefit here: only about 3.0km of pole-friendly terrain.

Quad damage

Quad damage risk is moderate (index 20 of 100), with 15% of the load in the first half: 0 descents deserve a plan and a couple of downhill sessions before race day.

  • 41.8–53.2 km · 639 m D−, -5.6% · 8.3 km ahead → your pace

Weather

On race day, start temperatures have historically ranged from 19°C to 24°C, with around 18°C at the highest point; the chance of precipitation is about 31%.

Results

1,294 finishers completed the 2025 edition. Men's winner: Peng Tian (China) in 5:02:46. Women's winner: Aurore Dacier (France) in 5:44:07.

This page has the full results and splits, a pacing and nutrition planner, a gradient matrix, an interactive elevation profile and historical weather for Jeju 70K.

Other distances of TransJeju by UTMB 2025Jeju 100M (148km)·Jeju 100K (100km)

Other editions of Jeju 70K2026

Official websitetransjeju.utmb.world