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Vucko Trail
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BLACK COURSE

105.0km·5800m+
June 19
Bjelašnica, Sarajevo,
Bosnia & Herzegovina
source

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Other races: Bosnia & Herzegovina

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

100K trail race calendar

BLACK COURSE · Race profile

Distance
105km
Gain
5800m+
FlatKM
172.8
Max
1906m
Min
438m

About BLACK COURSE

BLACK COURSE is the 105km skyultra at Vucko Trail 2026 (Bjelašnica, Sarajevo, Bosnia & Herzegovina). The race starts on June 19, 2026.

Race strategy

Hold a steady pace and save energy for every section.

  • 855m descent. Go easy, save your quads.
  • Steep 34% wall. Control your pace and stay focused.
  • 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 climb, save your quads on the descents until 76.9km, then run your race pace.
  • Start · 0.0km–1.4km · Race-day nerves push your heart rate up: don't follow the crowd, find your own rhythm.
  • Settle in · 1.4km–23.3km · 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.
  • Work · 23.3km–51.5km · Descent of 311m averaging 14%, descent of 855m averaging 16%, climb of 895m. Plus 1 more climb. 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.
  • Fade · 51.5km–85.7km · Descent of 598m averaging 7%, climb of 829m, high point 1912m, descent of 902m averaging 19%. Plus 1 more climb. Your energy fades, and that's normal: hold a steady effort and stop counting the miles. 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. Your heart rate drifts down on its own: don't chase your early-race numbers, go by feel.
  • Home · 85.7km–102km · 16.6km 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 5800m+. With 55m/km of climbing, this is a true mountain course with sustained climbs and descents. By gradient, 43% of the distance is uphill, 41% downhill and 16% flat. The longest climb runs 6.0km at an average 13.7% grade (829m of vertical). The longest descent runs 8.4km at an average 7.1% grade (598m of vertical). The steepest climb averages 33.9% over 0.5km. The steepest descent drops at 42.6% over 0.2km. Surface: 71% trail, 21% smooth, and 5% road. Flat-equivalent effort: 172.8 FlatKM.

Summits

The highest summit on the course is Vito (1960m), 70.9km from the start. Other named summits along the route: Delelaš (1907m). The course also passes close to Parič (1941m).

Poles

Poles bring little benefit here: only about 16.1km of pole-friendly terrain.

Quad damage

Quad damage risk is high (index 55 of 100), with 46% of the load in the first half: 4 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 climb, save your quads on the descents until 76.9km, then run your race pace.
  • #2 · 23.3–25.5 km · 311 m D−, -14.1% · 76.8 km ahead → control
  • #1 · 30.6–36.1 km · 855 m D−, -15.6% · 66.2 km ahead → control
  • #4 · 51.5–59.9 km · 598 m D−, -7.1% · 42.4 km ahead → control
  • #3 · 72.2–76.9 km · 902 m D−, -19.4% · 25.5 km ahead → control

Weather

On race day, start temperatures have historically ranged from 12°C to 22°C, with around 8°C at the highest point; the chance of precipitation is about 37%. Heavy rain of 10.0mm or more falls on about 7% of days around this date.

This page has a pacing and nutrition planner, a gradient matrix, an interactive elevation profile and historical weather for BLACK COURSE.

Other distances of Vucko Trail 2026RED COURSE (60.0km)·BLUE COURSE (40.0km)·YELLOW COURSE (26.0km)·GREEN COURSE (14.0km)

Other editions of BLACK COURSE2025

Official websitevuckotrail.ba/bs