Istria 100 by UTMB® 21K is the 21.5km trail race at Istria 100 by UTMB 2027 (Grožnjan, Croatia). The race starts on April 4, 2027 at 10:00 AM. It starts in Grožnjan and finishes in Umag. The time limit is 4 h.
The course climbs 157m+. With 7m/km of climbing, the course is predominantly runnable. By gradient, 4% of the distance is uphill, 14% downhill and 82% flat. Surface: 53% smooth, 23% trail, and 21% road. Flat-equivalent effort: 21.3 FlatKM.
The course also passes close to Pelegrin (185m) and Starola (165m).
The course is runnable enough that trekking poles are not needed.
There is too little runnable descent to damage the quads: plan the race around climbing and fuelling.
This page has a pacing and nutrition planner, a gradient matrix, an interactive elevation profile and historical weather for Istria 100 by UTMB® 21K.
Other distances of Istria 100 by UTMB 2027Istria 100 by UTMB® 168K (168km)·Istria 100 by UTMB® 110K (111km)·Istria 100 by UTMB® 69K (69.6km)·Istria 100 by UTMB® 42K (42.0km)
Other editions of Istria 100 by UTMB® 21K2026·2025
Official websiteistria.utmb.world
