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Header UTMB World Series

A UTMB World Series Event

The ultimate global trail running world series

UTMB® World Series is the world’s ultimate trail running circuit that unites the sport’s biggest stars and amateur runners through the best, leading international events in the most stunning locations.

Header UTMB World Series

Experience the UTMB adventure across the world

Built on a passion for the mountains with sustainability at its heart, UTMB® World Series gives all trail runners the chance to experience the UTMB® adventure across the world.

It is the only place where runners can begin their quest to UTMB® Mont-Blanc and the UTMB® World Series Finals.


As of 2022, the UTMB® World Series will integrate different levels of events.

UTMB World Series Calendar

The inaugural year for the UTMB World Series circuit in 2022 is closing out with some epic events around the world, with even more UTMB World Series Events to be added to the calendar in 2023. More extraordinary Events to be announced soon...stay tuned!

View the list of confirmed Events
Program UTMB World Series

Race Categories

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

20K UTMB World Series

The most accessible format

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

50K UTMB World Series

The challenging adventure

Fans of medium distances ranging between 50 and 100 km-effort, the 50K category is for you! The Finals of the 50K category will be held each year at the OCC race of UTMB Mont-Blanc.

100K UTMB World Series

The pathway to ultra endurance

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

100M UTMB World Series

The mythical distance

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

Running Stones

Collecting Running Stones is the only way to access the UTMB World Series Finals for regular runners.

What is a Running Stone ?

What is a Running Stone ?

A Running Stone is an entry into the lottery to participate in the UTMB World Series Finals: the UTMB, CCC and OCC races of the UTMB Mont-Blanc.

Only 1 Running Stone acquired in the past two years is mandatory to enter the lottery. Running Stones are cumulative, have no expiration date, and each Running Stone gives you an additional chance to be drawn.

How do I earn Running Stones ?

You can only collect Running Stones by finishing races in the 20K, 50K, 100K or 100M category at a UTMB World Series Event or UTMB World Series Major.

Discover the 29 events that will allow you to collect Running Stones in 2023 to enter the UTMB Mont-Blanc lottery from 2024 onwards.






UTMB Index

Only accessible on this website, the UTMB Index provides the performance level of each runner.

What is the UTMB Index ?

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 UTMB Mont-Blanc lottery.

Consult your UTMB Index

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

How do I get a valid UTMB Index ?

Elite runners

Under the new sports system, elite runners must qualify for the UTMB World Series Finals.

Qualification for elite runners

Qualification for elite runners

To gain access to the UTMB World Series Finals, the best athletes on the planet must qualify by taking part in the UTMB World Series Majors or UTMB World Series Events races over a period of 15 months. This allows elite runners to optimize their season and their recovery periods.

The first 10 men and women on the UTMB World Series Majors, as well as the first 3 men and women on the UTMB World Series Events in each of the 50K, 100K and 100M categories, will win a place at the UTMB World Series Finals in the equivalent category.

View detailed rules