woman walking on green grass field

Istria 100 by UTMB 21K

21K·157m gain·Istria
ultra100 mile100k50kmountainforesttechnicaltrailcoastalqualifier

Photo by Massimo Sartirana on Unsplash

Distance21K
Gain157m
Date10 Apr 2026
Difficulty2/5

Registration is closed for Istria 100 by UTMB 21K

Get alerted if spots open up or when next year's registration goes live.

About This Race

A half marathon introduction to Istrian trails with gentle elevation profile. Perfect for runners new to technical terrain while still experiencing the region's natural beauty and cultural elements.

A half marathon introduction to Istrian trails with gentle elevation profile. Perfect for runners new to technical terrain while still experiencing the region's natural beauty and cultural elements.

Elevation

↑ 157m(515 ft)

Elevation gain

Map showing Istria 100 by UTMB 21K location

Detailed elevation profile coming soon

Practical Info

Weather

Spring conditions with potential temperature swings from 0°C at night in mountain areas to over 25°C during the day. Sudden weather changes including rain, hail, and fog are possible.

Nearest Airport

PUY - Pula Airport

Required Gear
  • mobile phone with international roaming
  • mandatory safety equipment per UTMB standards

Best For

experienced trail runnersultrarunnersinternational travelers

Notable Features

Part of the prestigious UTMB World Series, this event uniquely combines challenging mountain terrain with coastal elements and cultural immersion through medieval Istrian towns. The courses feature technical single track, stream crossings, canyon passages, and elements of coasteering, making it one of the most diverse trail running experiences in Europe.