UTMB 2026 Chamonix: The Complete Trail Running Guide

The flagship: UTMB 174km around the Mont Blanc massif

Founded in 2003 by Michel and Catherine Poletti, the UTMB is the longest and most demanding race of the week. From the start gun in Chamonix town centre on Friday at 17:45, approximately 10,000 runners begin a 174km loop through France, Italy and Switzerland, crossing into Courmayeur at midnight and reaching Champex-Lac in Switzerland before dawn. The 46h45 cutoff means the last runners finish Sunday afternoon. The course accumulates 9,900m of positive elevation gain — more than Everest from base camp.

The five Running Stones required for the UTMB lottery make it the hardest race on the circuit to enter. Most athletes spend two to three seasons collecting stones before they qualify.

CCC and OCC: the qualifying ladder

The CCC (101km, 4 stones) and OCC (57km, 3 stones) serve dual purposes: they are World Series Finals in their own right, and they function as a stepping stone toward the UTMB for runners still building their stone count. The CCC departs Courmayeur on Friday morning at 09:00, running a near-parallel course to the UTMB before merging into the same finish in Chamonix. The OCC departs Orsières in Switzerland on Thursday at 08:15.

For runners targeting the Oman by UTMB 2026 in December, the OCC in August offers a logical mid-year stone accumulation opportunity on Alpine terrain.

The stone system in practice

Each stone functions as a lottery ticket: you earn stones by completing UTMB World Series races, and you enter the draw with however many you hold. A 20km race earns 1 stone, a 50km earns 2, a 100km earns 3, and a 100M earns 4. Races designated as World Series Majors — which includes UTMB Mont-Blanc itself — double the stone award. Stones expire two years after the last stone earned, but acquiring a new stone reactivates the entire stack.

Thresholds for 2026: the UTMB requires 5 stones, the CCC and TDS each require 4, the OCC requires 3. The MCC (40km) and ETC (15km) moved to a stones-free lottery format in 2026, giving runners at any stage of their career a way into the race village.

For international runners building their stone collection outside Europe, Patagonia Skyrace 2027 is one of the circuit events worth tracking for future seasons.

Tandem paragliding from Plan-Praz: the most reviewed flight in Chamonix

With 443 reviews and a 4.96 rating, the Plan-Praz tandem flight is the standout aerial experience in the Chamonix valley. No prior experience is required — you take off in tandem with a certified pilot and glide above the terrain the UTMB runners will cross Friday night. The flight typically lasts 10 to 15 minutes and lands in the valley close to town.

Alternative tandem flight: a second operator

If your preferred date is sold out, a second Plan-Praz operator offers the same route with a 4.90 rating across 115 reviews. Both depart from the same launch point and require the same 90-second cable car ride to reach Plan-Praz.

Aiguille du Midi: the 3,842m viewpoint

The Aiguille du Midi cable car is the most dramatic experience in the Alps accessible without mountaineering skills. From Chamonix town, a two-stage cable car rises from 1,035m to 3,842m in under 20 minutes, depositing visitors on a needle of granite surrounded by the Glacier du Geant and the full panorama of the Mont Blanc summit. On a clear day — and late August is consistently clear — the view extends from the Matterhorn to the Gran Paradiso. A private guided visit adds the Montenvers Mer de Glace ice cave to the itinerary.

Glacier viewpoints by e-bike: three hours on the valley floor

The e-bike tour circles the glacier viewpoints of the Chamonix valley on mountain roads and trails, reaching points that are either too steep or too far for a casual walk. At a 5.0 rating across 40 reviews, this is the most consistently rated active tour in the Chamonix Viator catalogue. It covers the Mer de Glace approach, the Argentiere glacier moraine and the forest trails below the Aiguille Verte — terrain that overlaps with the early kilometres of the UTMB course returning from Les Houches.

White-water rafting on the Arve

The Arve river runs directly beneath the UTMB finish line. The rafting descent covers glacially fed rapids below Mont Blanc — the cold, jade-green water coming directly off the Chamonix glacier system. This is a two-hour outing suitable for beginners and available throughout race week, making it a natural reset activity for support crew waiting between runner check-ins.

Guided hiking with a licensed mountain guide

If you want to walk the terrain the UTMB runs over without a race bib, a licensed guide opens up routes that require route-finding skills and local knowledge. The guided hike option covers the section above Chamonix toward the Col du Brevent with views over the entire valley and the race course below. Rated 5.0, with a high price point that reflects the cost of licensed guiding in the Mont Blanc massif.

La Flegere and Lac Blanc: the iconic viewpoint

La Flegere is a mid-mountain station above Chamonix reached by cable car. From the station, a 90-minute walk to Lac Blanc puts you at one of the most photographed spots on the entire course — a turquoise mountain lake ringed by granite peaks, with Mont Blanc directly opposite. Runners come through here in both directions on the UTMB course, making it the best single spectating spot on the mountain. Arrive before the cable car queues build: during race week the first cable is before 07:00.

Grand Col Ferret: the Italian border crossing

The Grand Col Ferret at 2,537m is the point where the UTMB crosses into Switzerland from Italy, approximately 130km into the race. On Friday night and Saturday morning, the flow of headlamps across the col in darkness is one of the most striking sights in trail running. The col is reached by a 90-minute hike from La Fouly in Switzerland or from the Arnuva valley on the Italian side. No cable cars, no crowds — just runners and mountains.

The Chamonix finish line

The UTMB finish on the main street in Chamonix is open to spectators throughout the weekend. The first elite runners arrive Saturday morning; the final finishers before cutoff come through late Sunday afternoon. Race week organisation channels spectators along barriers on both sides, and the atmosphere from Saturday noon onward approaches the intensity of a major city marathon finish. The CCC runners arrive on Saturday from their own Courmayeur start; the UTMB runners follow from Saturday evening.