INTERSPORT SPEED 15K is the 17.0km trail race at Julian Alps Trail Run by UTMB 2026 (Kranjska Gora, Slovenia). The race starts on September 20, 2026 at 10:40 AM. It starts and finishes in Kranjska Gora. The time limit is 4 h.
Run easy on the first mountain, then go all out on the second.
The course climbs 583m+. With 34m/km of climbing, this is a rolling, mostly runnable course. By gradient, 31% of the distance is uphill, 26% downhill and 43% flat. The longest climb runs 5.0km at an average 4.4% grade (222m of vertical). The longest descent runs 5.5km at an average 3.8% grade (210m of vertical). The steepest climb averages 34.2% over 0.3km. The steepest descent drops at 16.8% over 0.3km. Surface: 58% trail and 40% road. Flat-equivalent effort: 20.7 FlatKM.
The course is runnable enough that trekking poles are not needed.
Quad damage risk is low (index 8 of 100): a few descents worth noting, none of them decisive.
On race day, start temperatures have historically ranged from 11°C to 21°C, with around 16°C at the highest point; the chance of precipitation is about 40%. Heavy rain of 10.0mm or more falls on about 11% of days around this date.
622 finishers completed the 2026 edition. Men's winner: Samuel Demetz (Italy) in 1:09:17. Women's winner: Manca Mlekuž (Slovenia) in 1:23:03.
This page has the full results and splits, a pacing and nutrition planner, a gradient matrix, an interactive elevation profile and historical weather for INTERSPORT SPEED 15K.
Other distances of Julian Alps Trail Run by UTMB 2026I Feel Slovenia 120K (122km)·Lake Bled 80K (80.0km)·Sky Trail 50K (55.0km)·Kranjska Gora 25K (25.0km)·FUNNY 10K (11.0km)
Other editions of INTERSPORT SPEED 15K2025
Official websitejulianalps.utmb.world
