Tour du Mont Blanc

The Tour du Mont Blanc is the most walked long-distance alpine trail in the world. The 170km circuit around the highest mountain in Western Europe passes through three countries, crosses 10 significant passes, and offers uninterrupted views of the 4808m summit from every angle. Walking it at a standard pace takes 10-14 days. Running it at an athletic pace takes 3-6 days. Each is a different relationship with the same mountain.

The trail begins and typically starts in Chamonix, though there is no official starting point for the circuit. The route runs counterclockwise through the Vallée de Montjoie in France, crosses the Grand Col Ferret at 2537m into Italy at La Palud, traverses the Val d'Aoste through Courmayeur, crosses the Grand Col Ferret into Switzerland, traverses the Valais through Champex-Lac and Trient, and returns to Chamonix over the Balme and Forclaz passes.

The infrastructure is exceptional. Refuges and auberges are spaced every 15-20km on the standard route, and the population of Chamonix-valley infrastructure means resupply on any section is manageable. For runners, this means carrying minimal weight — a day's food, emergency gear, and a light layer is sufficient if refuge accommodation is accepted.

The terrain is consistently demanding. The passes are not technical but they are sustained — the Grand Col Ferret gains 750m in 3km from the Courmayeur side, which is a climbing rate that requires pacing at altitude regardless of the excellent surface. The Les Houches section above Chamonix is the most technical: narrow singletrack on exposed slopes above the Arve valley with significant drop-offs on the outer edge.

Weather determines everything. The Mont Blanc massif generates its own microclimate — afternoon cloud builds on the summit by noon in summer, and electrical storms can develop within an hour of clear blue sky. All ridge and pass crossings should be timed for morning. Do not be on the Grand Col Ferret in a lightning storm.

Most runners take 4-6 days on the full circuit. The UTMB race covers the same route in under 20 hours at the elite level — the comparative scale is useful context for planning your own schedule.