Discover the Arête des Cosmiques — Chamonix’s most iconic alpine route. Learn when to climb it, what to expect, and how to make the most of this unforgettable high-altitude adventure with Explore Chamonix.

Autumn in Chamonix is a season of contrast — and perhaps the most misunderstood one. Many travelers think of Chamonix as a destination for either skiing in winter or hiking and climbing in summer. Yet between those two high seasons lies a quieter, more intimate moment that locals secretly love: autumn.