UTMB Week – 2025 Edition in detail
Introduction: Ultra Trail de Mont Blanc
UTMB 2025 is shaping up to be the most thrilling edition yet, and as someone who crossed the finish line last year, I can’t help but share my insights to help you live the experience to the fullest. Whether you’re chasing an elite bib, planning to soak in the energy of Chamonix, or simply dreaming of taking part someday, this is the guide I wish I had before my first UTMB.
A taste of the UTMB magic
Last year, standing at the starting line in Place du Triangle de l’Amitié, I felt like a part of something far greater than just a race. That’s why, as we approach UTMB 2025, I want to break down every detail for you—from programming and elite bibs to logistics and hidden tips—so you’re ready for what is, without doubt, the Super Bowl of trail running.
A global festival with a mountain heart
To begin with, UTMB (Ultra Trail de Mont Blanc) week officially kicks off on Monday, August 25, 2025, but trust me—Chamonix begins to buzz a few days before that. Runners, brands, media crews, and fans flood in from all corners of the world, creating an atmosphere that’s both intimate and electric. Having experienced it firsthand, I recommend arriving by Saturday or Sunday to get ahead of the crowds, settle into your accommodation, and adjust to the altitude.
For reference, I stayed in Les Houches last year—quiet, scenic, and only 15 minutes from the main expo. That gave me a great balance between proximity and peace.
Key events and race schedule
Although there’s no shortage of action during UTMB Week, here are some key events you’ll want to lock into your calendar:
Monday to Wednesday: Race bib collection and expo activities.
Wednesday: The week heats up with the MCC (Martigny-Combe to Chamonix), which is usually for volunteers and locals. Great atmosphere to spectate.
Thursday Morning: TDS (Sur les Traces des Ducs de Savoie) finishers flood the square.
Thursday Evening: OCC start—perfect for beginners chasing the UTMB dream.
Friday Morning: CCC kicks off in Courmayeur—my personal favorite race, and the one I ran last year.
Friday Evening: The main event begins. UTMB 100M runners depart into the night.
Sunday: Closing ceremony and final arrivals of 100M runners.
Elite bibs: More than just speed
If you’re gunning for an elite bib in UTMB 2025, the path isn’t just about fast legs—it’s about planning and precision. Here’s what you need to know:
UTMB Index Requirements:
100M: 800+ (men) / 645+ (women)
100K: 770+ / 615+
50K: 720+ / 570+
20K: 670+ / 530+
You can check your current index on the UTMB Index page. If you’re close, sign up for qualifying UTMB World Series races before the season ends. Every point counts.
Deadline for Elite Registration: Mark your calendar—April 15, 2025 is your cut-off. Don’t wait till the last minute like I did in 2024, when I almost missed my slot for CCC!
Bib draws and running stones
Now, let’s say you’re not in elite territory (yet). No worries—UTMB 2025 still welcomes runners through the lottery system, which uses Running Stones earned at official events.
1 race = 1 to 4 Running Stones, depending on distance.
Each stone is one entry into the lottery.
More stones = better odds.
After last year’s CCC, I had 3 stones, and got in on my second attempt. If you’re planning for 2026 or beyond, it’s a good idea to start building those stones now.
On the ground in Chamonix: Logistics & life
Let me be honest—logistics can make or break your week. Chamonix is small and UTMB week is packed. Here’s my advice from a runner’s perspective:
Book lodging by February—everything sells out by spring.
Use the UTMB shuttle buses; they’re free with your bib and save you tons of stress.
Pack for all seasons. I ran in sun, fog, rain, and snow—all in one race.
Also, don’t miss the UTMB Expo—a paradise of trail gear, nutrition, and freebies. I picked up my current race vest there and even got it signed by Xavier Thévenard.
The race experience itself
When the race starts, it’s pure magic.
During the CCC, I felt chills as I left Courmayeur and climbed to Tête de la Tronche. Supporters lined the trails with cowbells and cheers in every language. Aid stations were flawlessly organized—trust me, those slices of cheese at La Fouly saved my race.
While running, I found myself trading stories with a Norwegian runner and getting cheered on by a group from Japan. It reminded me why UTMB isn’t just a race—it’s a global community on legs.
Green goals: The eco-conscious shift
This year, UTMB has stepped up its game environmentally. Cups at aid stations are gone—you’ll need your own. They’ve increased compost bins, reduced plastic signage, and launched a carbon-offset campaign. As someone who loves the trails, this shift is something I fully support.
Looking ahead: Why UTMB 2025 is a must
As we head into UTMB 2025, the anticipation is real. Whether you’re racing, volunteering, or just spectating, it’s a journey that changes you. The sheer scale, the attention to detail, and the community spirit set UTMB apart.
After experiencing it firsthand in 2024, I can say this with confidence: you haven’t truly trail run until you’ve felt the heartbeat of UTMB.
