31.7km is the 31.7km trail race at Kočevsko Outdoor Festival 2026 (Jezero Kočevje, Slovenia). The race starts on May 30, 2026.
Run hard on the first mountain, but save energy for the second.
The course climbs 1016m+. With 32m/km of climbing, this is a rolling, mostly runnable course. By gradient, 31% of the distance is uphill, 36% downhill and 33% flat. The longest climb runs 2.3km at an average 7.1% grade (163m of vertical). The longest descent runs 4.9km at an average 5.0% grade (247m of vertical). The steepest climb averages 26.0% over 0.2km. The steepest descent drops at 19.1% over 0.3km. Surface: 66% trail, 19% smooth, and 12% technical. Flat-equivalent effort: 43.1 FlatKM.
The highest summit on the course is Veliki Rog (1099m), 2.3km from the start. Other named summits along the route: Lovski vrh (830m). The course also passes close to Bezgova gorica (1009m).
The course is runnable enough that trekking poles are not needed.
Quad damage risk is moderate (index 20 of 100), with 55% of the load in the first half: 1 descent deserves a plan and a couple of downhill sessions before race day.
On race day, start temperatures have historically ranged from 10°C to 19°C, with around 14°C at the highest point; the chance of precipitation is about 47%. Heavy rain of 10.0mm or more falls on about 10% of days around this date.
207 finishers completed the 2026 edition. Men's winner: Sandor Szabo (Hungary) in 2:28:45. Women's winner: Aja Kozinc (Slovenia) in 3:12:33.
This page has the full results and splits, a pacing and nutrition planner, a gradient matrix, an interactive elevation profile and historical weather for 31.7km.
Other distances of Kočevsko Outdoor Festival 202661.5km (61.5km)·14km (14.1km)·10km (10.2km)·Vertical (2.6km)
Other editions of 31.7km2027·2025
Official websitekocevsko-outdoor.si/en