100 Miles of Istria

The Istria 100 Miles challenges you with rugged coastal paths, and endless Adriatic beauty. Push your limits in Croatia’s ultimate ultra!

What to expect from the event

Discover the inspiration to take the last step. The most motivating adventure of your life starts here.

About 100 Miles of Istria

In 2015, the endurance race “100 Miles of Istria” will take place on the northwest lying peninsula for the third time. Similar to last year, the athletic participants must cross the entire peninsula during the race that starts in Labin in the east and finishes in Umag in the northwest. All in all, the runner must cover 173 kilometers, which includes having to be able to overcome 7002 meters of ascent and 7016 meters of descent. Last year, around 496 runners made it from Labin to Umag. These runners have traveled to Istria from over 22 different countries in order to compete with themselves and other athletes. In the meanwhile, this endurance race is regarded as the unofficial qualifying race for the Trail World Cup in Mont Blanc, France.

The event is arranged to take place in the second half of April (April 17 to 19 in 2015), which not only provides the ideal climatic conditions for the runners, but also attracts tourists. The 173 kilometer route is not for the inexperienced athlete, especially since the organizers specify a time limit of 48 hours. Those who are not yet able to accept this challenge can participate in the shorter races that take place at the same time. Interested athletes can choose routes from 65 to 110 kilometers with a time limit of 16 or 33 hours. A few days before the “100 Miles of Istria” race there is a mini-event with a 1-kilometer run. The race starts at noon in Umag and even children and adolescents can join in on the athletics. To participate in the “100 Miles of Istria” race, you will have to pay 114 euros. Registration for the race is only possible until March 15, 2015, as long as the number of participants does not exceed 300 runners.

Discover the races

ISTRIA 100 by UTMB, launched in 2013, now draws 3,000+ runners worldwide across five distances. The routes feature Istria’s toughest trails, medieval towns, forests, coastlines, and stunning views.

Where is the Istria 100-mile race

The 100 Mile race starts in 4 different towns of Istria, depending the distance you want to do:

168K in Lavin, 110K & 69K iun Buzet, 42K in Motovun and 21K in Groznjan.

The 100 miles race, the trai of the trails in Croatia

* Photos property of 100 miles of Istria Ultratrail by UTMB

Good to know before

Race date: 9 – 12 April 2026

Distances: 168K, 110K, 69K, 42K, 21K

Event location & Runner Check-In: Umag, Istria,Croatia

Registration Fee covers services and gifts that await runners for the Istria 100 by UTMB experience:

Start pack gift for all distances
Finisher medal for all the runners who conquer the trails and pass through the finish
Unique trophy for the best ones in each distance who will be awarded at the prize giving ceremony
Organization of the races with all the services provided on the course (food and drinks on the aid station, timing services, medical service, transportation in case of dropping out from the race
Well deserved showers and massage after the race at the sports centre
Hot meal at the restaurant after the race to recover faster
Registration and expo services on site with all other locations set-up
Drop bag services from starts and aid stations, depending of the race

Register here at UTB

To have acquired, before to the race, a real understanding of personal autonomy in the mountains/terrain allowing for the management of potential problems encountered during this type of event, notably:

Ability to confront, without outside assistance, changing climatic conditions which could be very difficult to deal with at altitude (night, wind, cold, fog, rain or snow).
Ability to manage, including when one is isolated, physical or mental problems arising from a heavy fatigue, digestive problems, muscle or articular/joint pains, small wounds, etc…
Aware that the organization’s role is not to help a runner manage these problems.
Aware that for such an activity in the mountains, safety depends upon the runner’s ability to adapt to the problems encountered or foreseen.
To inform and educate the runner’s supporters towards the respect of nature, people, and the regulations of the race.

More info here.

PLANE