Ultra-Trail du Mont-Blanc

Few events in the world of trail running stir the soul quite like the Ultra-Trail du Mont-Blanc (UTMB). For seasoned ultrarunners, it’s the ultimate test of endurance, grit, and mountain savvy. For newcomers, it’s a beacon of inspiration—a race that sits atop bucket lists and fires up dreams of running beneath the shadow of Europe’s highest peak. But UTMB is more than a race; it’s a week-long festival of adventure, camaraderie, and the raw beauty of the Alps, drawing thousands to the iconic town of Chamonix every year.

The Ultra-Trail du Mont-Blanc, affectionately known as UTMB, is the crown jewel of trail running. Each August, runners from all corners of the globe gather in Chamonix, France, to tackle a gruelling loop around the Mont Blanc massif. The main event covers roughly 170–176 km (106–109 miles), with over 10,000 metres (32,800 feet) of ascent—think of it as climbing Everest from sea level, and then some, all on foot.

The route isn’t just about the numbers. It’s a journey through three countries—France, Italy, and Switzerland—on rugged mountain trails, over high passes, and through picturesque alpine villages. The challenge is as much mental as physical: runners face unpredictable weather, technical terrain, and the need to keep moving through one, sometimes two, nights. The reward? A finish in Chamonix’s vibrant square, cheered on by thousands, and the knowledge you’ve completed one of the world’s toughest endurance feats.

UTMB’s story began in 2003, when a small group of passionate trail runners decided to create a race that would circle Mont Blanc, following the classic hiking route. That first year, just over 700 runners set off from Chamonix, many unsure if the challenge was even possible. Fast forward to today, and UTMB has exploded in both size and stature. The main race now welcomes over 2,500 starters, and the event has grown into a week-long festival featuring multiple races, an expo, and a global community spirit.

The race’s prestige has only grown, with UTMB now serving as the grand finale of the UTMB World Series. It’s the race every elite wants to win and every trail runner wants to finish. Legendary names like Kilian Jornet, François D’Haene, Courtney Dauwalter, and Lizzy Hawker have all left their mark here, but the real magic is in the thousands of “ordinary” runners who chase their own extraordinary finish.

The UTMB course is a spectacular loop around Mont Blanc, starting and finishing in Chamonix. Over 170–176 km, runners traverse the borders of France, Italy, and Switzerland, climbing more than 10,000 metres along the way.

• Chamonix to Les Houches → The opening miles are fast and relatively gentle, a chance for runners to settle their nerves before the first big climb.
• Saint-Gervais and Les Contamines → Night falls as runners pass through lively villages, cheered on by enthusiastic crowds and the sound of cowbells.
• Col du Bonhomme and Col de la Seigne → The real mountain work begins, with steep ascents and rocky trails often tackled in darkness.
• Courmayeur (Italy) → The halfway point and a crucial aid station, where many runners see their support crews for the first time.
• Grand Col Ferret → The highest point of the race (2,537m), marking the border into Switzerland and often a pivotal moment in the race.
• Champex-Lac, Trient, Vallorcine → The final third is a test of resilience, with relentless climbs and descents before the emotional return to Chamonix.

The scenery is as breathtaking as the challenge—glaciers, wildflower meadows, and panoramic views at every turn. But the weather can be fickle: blazing sun, freezing rain, and even snow are all possible, sometimes within the same day.

UTMB isn’t just tough—it’s iconic. Here are some of the key stats that define the event:

• Distance → 170–176 km (varies slightly each year)
• Elevation Gain → 10,000m+
• Countries → France, Italy, Switzerland
• Start/Finish → Chamonix, France
• Highest Point → Grand Col Ferret (2,537m)
• Cut-off Time → 46.5 hours
• Average Finisher Rate → 60–70%
• Start Time → 6pm, Chamonix
• Participants → Over 2,500 in the main race

Getting to the start line of UTMB is an achievement in itself. With demand far outstripping available spots, the entry process is both competitive and complex.

1. Earn a UTMB Index → Complete UTMB World Series or Index races of the appropriate distance to demonstrate your experience.
2. Collect Running Stones → Each World Series race you finish earns you Running Stones, which serve as lottery entries. The more Stones you have, the better your odds.
3. Enter the Lottery → Submit your application with your Stones and Index. If you’re drawn, you’re in!
4. No Stones, No Entry → Only runners with Running Stones and a valid UTMB Index can enter the lottery.

UTMB isn’t just a race—it’s the beating heart of the global trail running community. It’s a place where elites and amateurs share the same course, where stories of perseverance are celebrated, and where the mountains inspire everyone to push their limits.

The event also includes several other races during UTMB week, such as CCC (Courmayeur-Champex-Chamonix), TDS (Sur les Traces des Ducs de Savoie), OCC (Orsières-Champex-Chamonix), and more, offering challenges for a range of abilities and ambitions.

• Trail running shoes (with good grip and cushioning)
• Technical clothing (moisture-wicking, quick-drying)
• Waterproof jacket and trousers
• Headlamp (with spare batteries)
• Hydration system (bottles or bladder)
• Nutrition (gels, bars, real food)
• Poles (for climbs and descents)
• GPS watch (for navigation and pacing)
• First aid kit and emergency supplies

Explore the latest trail running gear at Runners Need. Whether you’re a seasoned ultrarunner or just starting out, we’re here to help you every step of the way.