Sport and timing
Ultra-Trail du Mont-Blanc: 170 km around the Alps' highest mountain with a 46-hour, 45-minute cutoff
· 5 min read
In short
- UTMB, the Ultra-Trail du Mont-Blanc, was first held in 2003. Its main route covers approximately 170 kilometres and more than 9,900 metres of elevation gain around Mont Blanc through France, Italy and Switzerland.
- In recent editions, the overall time limit for completing the main route was 46 hours and 45 minutes — the exact figure may change between editions, and the limit published by the organizer for the relevant year always applies.
- The cutoff at a checkpoint is based on when a runner must LEAVE, not when they must arrive — anyone who departs late is eliminated, regardless of how they feel at that moment.
- The organizer may adjust the cutoffs if the route changes because of weather or safety concerns, so the exact limits are always published in the Runner's Guide for the relevant edition.
The Ultra-Trail du Mont-Blanc is one of those events where timing is not merely about speed, but above all about completing a demanding route within safe limits.
Around the Alps' highest mountain since 2003
UTMB was first held in 2003. The main route covers approximately 170 kilometres, with almost 10,000 metres of elevation gain, circling Mont Blanc through France, Italy and Switzerland.
A limit of 46 hours and 45 minutes
In recent editions, the overall time limit for completing the main route was 46 hours and 45 minutes — the exact figure may change between editions, and the limit published by the organizer for the relevant year always applies. The race starts on Friday evening, and the limit expires on Sunday afternoon. Other endurance events have similarly long cutoffs; read more in Event time limits: Ironman, Comrades and ultramarathons.
Departure, not arrival
The crucial detail is that a checkpoint cutoff is based on when a runner must leave, not when they must arrive. If a runner reaches a checkpoint just before the cutoff but fails to leave in time, they are eliminated regardless of how they feel. This rule supports both logistics and safety by allowing organizers to plan more precisely when the course can be closed.
Conditions can change
The limits are not set in stone — the organizer may adjust them if the route changes because of weather or safety concerns. The exact figures are therefore always stated in the Runner's Guide for the relevant edition rather than in a general rule that remains unchanged forever.
What smaller events can learn from UTMB
A local mountain or trail race can use the same principle: set a deadline for leaving a checkpoint instead of one for arriving. It is easier to plan and clearer for runners. For practical advice on setting up checkpoints and cutoffs, see How to organize a race: timing and checklist.
Frequently asked questions
What is the overall UTMB time limit?
In recent editions, it was 46 hours and 45 minutes for the main route, which covers around 170 km and almost 10,000 metres of elevation gain, with the start taking place on Friday evening. The exact limit may change between editions, and the current Runner's Guide for that year's race is always definitive.
How does a checkpoint cutoff work?
The cutoff is based on the time by which a runner must leave the checkpoint, not their arrival time. Anyone who fails to depart by the stated cutoff is eliminated, even if they reached the checkpoint in good condition.
When was the first UTMB held?
In 2003. Since then, it has become one of the world's best-known and most prestigious ultra-trail events.
Which countries does the UTMB route cross?
The main event follows a route around Mont Blanc through France, Italy and Switzerland.