What is the UTMB index?

Assessing the performance level of each trail runner, the UTMB Index is calculated for each of the 4 UTMB World Series race categories: 20K,50K,100k and 100M. Trail runners are also given a General UTMB Index calculated by combining results from all race categories.

A valid UTMB Index is mandatory to enter the Dacia UTMB Mont-Blanc lottery.

The ultimate global trail running World Series

Uniting the sport’s biggest stars and amateur runners through the best, leading international events in the most stunning locations, the UTMB World Series gives all trail runners the chance to experience the UTMB adventure across the world, with 36 events taking place across Asia, Oceania, Europe, Africa and the Americas in 2023. It is the only place where runners can begin their quest to Dacia UTMB Mont-Blanc, where the prestigious UTMB World Series Finals will be held.

The UTMB World Series integrates three levels of event:

  • UTMB World Series Finals
  • UTMB World Series Majors
  • UTMB World Series Events

How do I get a valid UTMB Index?

A valid UTMB Index is achieved by completing at least one race of the UTMB World Series or a UTMB Index race in the relevant category within the previous 24 months. Once a race category has at least 1 valid result, all races from the past 36 months will be used to calculate your UTMB Index.

To enter the Dacia UTMB Mont-Blanc lottery for the race of your choice, you must have a valid UTMB Index as per the chart.


There are 4 UTMB World Series race categories including 20K, 50K, 100K and 100M.

The most accessible format

Perfect for outdoor enthusiasts looking for a first trail running expierience or for trail runners who want to challenge themselves or train on a short distance.

The challenging adventure

Fans of medium distances ranging between 50 and 100km-effort, the 50K category will be held each year at the OCC race of Dacia UTMB Mont-Blanc

The pathway to Ultra endurance

A unique way to test yourself over a 100km effort and expierience a full day on the trails, with the epic CCC race of Dacia UTMB Mont-Blanc becoming the Finals of the 100K category.

The Mythical distance

Push your limits and achieve the ultimate trail running dream of completing a race over 170km. The pinnacle UTMB race of Dacia UTMB Mont-Blanc becomes the Finals of the 100M category.