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INTERSPORT SPEED 15K is a 17.0 km trail race of Julian Alps Trail Run by UTMB 2026 in 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.
The course climbs 583 m+. With 34 m/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 2.4 km at an average 6.1% grade (143 m of vertical). The longest descent runs 2.7 km at 9.4% (251 m of vertical). The steepest climb averages 34.2% over 0.3 km. The steepest descent drops at 16.8% over 0.3 km. Surface: 58% trail and 40% road. Flat-equivalent effort: 21.2 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 noticing, none that decides the result.
Historically on race day, start temperatures range from 11°C to 21°C, around 16°C at the highest point; the chance of precipitation is about 40%. Heavy rain of 10.0 mm or more falls on about 11% of days around this date.
This page has the interactive elevation profile, gradient matrix, pacing and nutrition planner and weather climatology for INTERSPORT SPEED 15K.
Other distances of Julian Alps Trail Run by UTMB 2026I Feel Slovenia 120K (122 km)·Lake Bled 80K (80.0 km)·Sky Trail 50K (55.0 km)·Kranjska Gora 25K (25.0 km)·FUNNY 10K (11.0 km)
Other editions of INTERSPORT SPEED 15K2025
Official websitejulianalps.utmb.world
