UTMB 2026: The Complete Guide to the Ultra-Trail du Mont-Blanc

The UTMB — Ultra-Trail du Mont-Blanc is the world's most iconic ultra-trail race. Every year in late August, Chamonix becomes the global epicentre of trail running as thousands of athletes from 100+ countries attempt to circumnavigate the Mont Blanc massif on foot through France, Italy and Switzerland.

ℹ️ Last verified: March 2026. Always check utmb.world for the latest dates, prices and entry info for 2026.

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Founded in 2003, UTMB Week now gathers 10,000+ participants from 100+ countries across multiple distances:

⚠️ Distances and requirements may vary. Verify at utmb.world.

The main race covers ~171 km with ~10,000m D+, start and finish in Chamonix, France.

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You need 10 ITRA points from UTMB World Series qualifying races. Full list at utmb.world/races.

With enough points, you register for the draw (opens in autumn of the prior year). Unused rights carry over and improve future odds.

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Chamonix → Les Contamines → Col de la Seigne (~2,516 m, FRA-ITA border) → Courmayeur (~82 km, life base) → Gran Col Ferret (~2,537 m, ITA-SUI border) → Champex-Lac (~120 km) → Vallorcine → Argentière → Chamonix.

Time limit: 46h30m. Cut-offs at every life base. Weather is notoriously unpredictable: August snow possible, ridge winds, night temperatures below -5°C.

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UTMB demands years of progressive build-up:

• 2 years out: 50-80 km ultras, solid aerobic base.
• 12 months out: 80-120 km/week. Race UTMB WS qualifiers.
• 6 months out: Mountain training blocks. 100+ km simulation.
• 3 months out: Peak load weeks (160+ km). Night runs with headlamp.
• 6 weeks out: Taper. Zero injury risk.

Key sessions: back-to-back weekends, night runs, technical hiking, hill repeats, eccentric downhill strength.

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Getting to Chamonix:

• ✈️ Geneva (GVA) — ~1h by direct bus or car
• ✈️ Lyon (LYS) — ~2h30
• 🚂 Chamonix-Mont-Blanc to Martigny (CH) / Annecy / Lyon
• 🚗 A40 motorway

Accommodation: Book at least 12 months ahead. UTMB Week fills Chamonix weeks in advance.

Mandatory gear (general — verify officially each year at utmb.world): Pack ≥5L · waterproof jacket (sealed seams) · long trousers/tights · hat & gloves · headlamp + spare battery · emergency blanket · charged phone · ID.

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• Men's CR: François D'Haene — 20h11m (2021)
• Women's CR: Katie Schide — 22h55m (2023)
• Average finish time: ~35-38 hours · DNF rate: 25-40%

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The qualification lottery: UTMB uses a running lottery system. More ITRA points = more "running rights" = better lottery odds. Athletes who don't win the lottery in year 1 carry their rights forward, increasing odds in subsequent years.

Typical time in the lottery process: Most athletes with 10 ITRA points win a slot within 2-4 lottery cycles.

Support crew logistics: Crew is allowed at major bases de vie (Courmayeur, Champex-Lac, La Fouly). Plan crew logistics in advance — parking near bases de vie is limited and fills early.

Drop bags: Available at key aid stations. Pack weather-adaptive clothing (dry layers for night) and comfort foods.

The most common mental surprise for first-timers: the weather changes dramatically between Chamonix (valley) and the high cols. A clear, warm evening in Chamonix can mean cold, windy, wet conditions on the Col de la Seigne.

Carry your full mandatory kit from the start — don't pack it in a drop bag expecting to add it later.

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See the full ultra-trail calendar →

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The waiting and the night: Most UTMB finishers spend at least 15-20 of their 35+ hours running in complete darkness. Your ability to run at pace through fatigue and low-alertness in the night hours is a separate skill from daytime running. Train it specifically.

The weather volatility: Even experienced alpine runners are surprised by how quickly conditions change on the UTMB course. A clear, warm evening in Chamonix can become cold, wet, and windy on the Col de la Seigne within 2 hours. Having your full mandatory kit accessible — not buried in a pack — is the difference between a comfortable and a miserable night.

The community: UTMB Week in Chamonix is unlike any other event in trail running. The village fills with athletes from 100+ countries. Cafes are open at 4am to watch finishers come through. The atmosphere is electric for the entire week.

Managing your UTMB run emotionally: Many finishers say the last 20 km — with Chamonix visible in the valley below, lights twinkling in the night — is both the hardest and most emotional stretch. Every step is earned. The crowd at the finish line on Rue du Docteur Paccard has been waiting for hours.

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SportPlan lets you filter by sport, date, city, and distance — all in one place. For this event, you can verify:

• Exact distance and date
• Course profile and elevation
• Registration requirements and deadlines
• Nearby events to complete your calendar

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Before participating, ensure you have the right equipment. General recommendations for any event type:

• Shoes: Trail shoes for off-road courses; road shoes for asphalt events
• Hydration: Ensure sufficient water and electrolytes based on duration
• Nutrition: For longer events, stick to the strategy you've tested in training
• Safety: Know the course; have an emergency phone accessible

Regardless of event type, these training principles apply:

Aerobic base: At least 3-4 months needed for a solid aerobic base. Weekly key sessions: one long run, one tempo/threshold session, and active recovery.

Hill training: For mountain events, specific work on ascents and descents is essential. Eccentric quad strength is critical for downhill running.

See the full calendar →