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Julian Alps Trail Run by UTMB
Estimated date — the organiser has not announced the exact day yet
The Julian Alps Trail Run by UTMB is Slovenia's largest trail festival and the country's only UTMB World Series event; it takes place in September in Kranjska Gora, and in 2025 it drew more than 5,000 runners from over 80 countries. Races are 122 km (5,855 m of climbing), 80 km, 55 km, 25 km, 17 km and 11 km, plus a NextGen race for young runners, and finishers earn UTMB points and Running Stones towards Mont-Blanc. The courses take in the country's most iconic places — single trails, dense forests and alpine meadows in Triglav National Park, with the long routes reaching Lake Bled. It feels like a true international trail party in a small alpine town. Kranjska Gora offers Lake Jasna, the Vršič pass, the Planica valley with its giant ski jumps and nearby Bled with its island and cream cake.
Course records
Weather in September
Starter pack 2025
- bib with timing chip
- finisher medal
- technical t-shirt
- goody bag