Istria 100 by UTMB® 110K is a 111 km ultra trail of Istria 100 by UTMB 2027 in Buzet, Croatia. The race starts on April 3, 2027 at 07:00 AM. It starts in Buzet and finishes in Umag. The time limit is 28 h.
The course climbs 4200 m+. With 38 m/km of climbing, this is a rolling, mostly runnable course. By gradient, 32% of the distance is uphill, 34% downhill and 34% flat. The longest climb runs 2.9 km at an average 9.4% grade (272 m of vertical). The longest descent runs 3.7 km at 12.1% (454 m of vertical). The steepest climb averages 23.9% over 0.7 km. The steepest descent drops at 30.8% over 0.2 km. Surface: 46% trail, 31% smooth, and 19% road. Flat-equivalent effort: 134.1 FlatKM.
Poles bring little benefit here — only about 14.9 km of pole-friendly terrain.
This page has the interactive elevation profile, gradient matrix, pacing and nutrition planner and weather climatology for Istria 100 by UTMB® 110K.
Other distances of Istria 100 by UTMB 2027Istria 100 by UTMB® 168K (168 km)·Istria 100 by UTMB® 69K (69.6 km)·Istria 100 by UTMB® 42K (42.0 km)·Istria 100 by UTMB® 21K (21.5 km)
Other editions of Istria 100 by UTMB® 110K2026·2025
Official websiteistria.utmb.world
