When to Go
Valais is at its sunny best in high summer and midwinter; foggy dampness overwhelms in late autumn and spring. Mountain weather is impetuous, embracing with its warmth one day and obliterating views and trails the next. Take your cues from local forecasts and mountain operators who have an experienced sense about shifting patterns. Misty clouds move away in short order, opening up the path or vista for those who are patient.
Some of the best skiing and hiking can be had in March and September when crowds are the lightest and the sun is at its perfect arc. May, June, and November to mid-December are renovation, repair, and getaway times for locals. Facilities rotate closing periods, though, so there's always a fluffy bed and good meal.