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Vucko Trail
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BLUE COURSE

40.0km·1800m+
June 19
Bjelašnica,
Bosnia & Herzegovina
source

Race Pace Calculator · GPX Analyzer · Trail Finder

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Read

  • How to Taper for a Marathon, Half Marathon or Ultra
  • Types of Runs and What Each Workout Actually Trains
  • Hill Training for Trail Runners: Train the Descents

Marathon trail race calendar

BLUE COURSE · Race profile

Distance
40.0km
Gain
1800m+
FlatKM
56.3
Max
1745m
Min
1252m

About BLUE COURSE

BLUE COURSE is the 40.0km trail race at Vucko Trail 2027 (Bjelašnica, Bosnia & Herzegovina). The race starts on June 19, 2027.

Race strategy

Run hard on the first mountain, but save energy for the second.

  • Start easy and control your HR up to 10.3km.
  • Hold your race pace up to 34.6km, but stay in control.
  • Control your HR on the first climb, then run your race pace, and go all out on the final descent from 34.6km.
  • Start · 0.0km–1.8km · Race-day nerves push your heart rate up: don't follow the crowd, find your own rhythm.
  • Settle in · 1.8km–10.3km · 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 · 10.3km–34.6km · Climb of 311m, high point 1749m. Plus 2 more descents. This is where the race is built: steady, solid effort. Climb by heart rate or breathing, not pace. Running pays off here: run wherever you can.
  • Home · 34.6km–39.4km · Descent of 335m averaging 7%. No heroics: settle back into your own effort and hold it to the line.

Course

The course climbs 1800m+. With 45m/km of climbing, this is a true mountain course with sustained climbs and descents. By gradient, 41% of the distance is uphill, 39% downhill and 20% flat. The longest climb runs 3.5km at an average 10.7% grade (371m of vertical). The longest descent runs 4.8km at an average 7.0% grade (335m of vertical). The steepest climb averages 36.8% over 0.3km. The steepest descent drops at 26.4% over 0.4km. Surface: 79% trail and 15% smooth. Flat-equivalent effort: 56.3 FlatKM.

Summits

The highest summit on the course is Veliki Hrakač (1619m), 2.5km from the start. The course also passes close to Saruk (1726m) and Siljevača (1662m).

Poles

Poles bring little benefit here: only about 1.7km of pole-friendly terrain.

Quad damage

Quad damage risk is moderate (index 21 of 100), with 48% of the load in the first half: 0 descents deserve a plan and a couple of downhill sessions before race day.

  • Control your HR on the first climb, then run your race pace, and go all out on the final descent from 34.6km.
  • 34.6–39.4 km · 335 m D−, -7.0% · 0.0 km ahead → free

    • Weather

    On race day, start temperatures have historically ranged from 12°C to 22°C, with around 17°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 BLUE COURSE.

    Other distances of Vucko Trail 2027BLACK COURSE (105km)·RED COURSE (60.0km)·YELLOW COURSE (26.0km)·GREEN COURSE (14.0km)

    Other editions of BLUE COURSE2026·2025

    Official websitevuckotrail.ba/bs