Jeju 100M

Race strategy

Hold a steady pace and save energy for every section.

• Big early climb with 1690m gain. Hold your pace, save your legs for later.
• 1078m descent. Go easy, save your quads.
• 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.
• Control your HR on the first mountain, save your quads on the descents until 62.0km, then run your race pace.
• Start · 0.0km–1.2km · Race-day nerves push your heart rate up: don't follow the crowd, find your own rhythm.
• Settle in · 1.2km–22.7km · Climb of 1688m. Ease in: hold back more than feels necessary. The race is still ahead. Climb by heart rate or breathing, not pace. Hike the steepest pitches.
• Work · 22.7km–62.0km · Descent of 1078m averaging 10%, climb of 1409m, high point 1913m, descent of 1372m averaging 10%. This is where the race is built: steady, solid effort. Climb by heart rate or breathing, not pace. This descent is hard on the legs: short steps, stay in control, poles if you have them. Running pays off here: run wherever you can. Hike the steepest pitches.
• Fade · 62.0km–139km · Plus 2 more climbs and 2 descents. Your energy fades, and that's normal: hold a steady effort and stop counting the miles. Climb by heart rate or breathing, not pace. Running pays off here: run wherever you can. Your heart rate drifts down on its own: don't chase your early-race numbers, go by feel.
• Home · 139km–147km · 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

The course climbs 5000m+. With 34m/km of climbing, this is a rolling, mostly runnable course. By gradient, 33% of the distance is uphill, 33% downhill and 35% flat. The longest climb runs 22.7km at an average 7.4% grade (1688m of vertical). The longest descent runs 13.3km at an average 10.4% grade (1372m of vertical). The steepest climb averages 33.8% over 0.5km. The steepest descent drops at 30.7% over 0.9km. Surface: 54% trail, 24% road, 8% smooth, and 6% technical. Flat-equivalent effort: 200.5 FlatKM.

Poles

Poles bring little benefit here: only about 14.0km of pole-friendly terrain.

Quad damage

Quad damage risk is high (index 51 of 100), with 65% of the load in the first half: 2 critical descents, the last of them run on already damaged legs. Downhill-specific preparation and a controlled early pace pay off here.

• Control your HR on the first mountain, save your quads on the descents until 62.0km, then run your race pace.
• #1 · 22.7–33.1 km · 1078 m D−, -10.4% · 113.8 km ahead → control
• #2 · 48.7–62.0 km · 1372 m D−, -10.4% · 84.9 km ahead → control
• 119.4–125.9 km · 291 m D−, -4.5% · 21.0 km ahead → your pace
• 129.0–138.6 km · 530 m D−, -5.5% · 8.3 km ahead → your pace

Weather

On race day, start temperatures have historically ranged from 20°C to 25°C, with around 12°C at the highest point; the chance of precipitation is about 32%. Heavy rain of 10.0mm or more falls on about 12% of days around this date.

Results

363 finishers completed the 2026 edition. Men's winner: Minchul Ko (South Korea) in 16:27:13. Women's winner: Seimiya Yukari (Japan) in 19:55:19.