Switzerland
Best time to ski in Switzerland: natural snow month by month
When natural snow has been most reliable at the 2 resorts Cirque models in Switzerland, month by month, from eleven winters of weather data.
Every resort Cirque models here
Each cell is one month: the share of days with 30 cm or more of modelled natural snow at mid-mountain over the last 11 winters, from brown (often thin) to deep blue (snow-sure). Blank means almost none.
The short answer
The surest time for natural snow in Switzerland has been January to May. In those months both resorts Cirque models here were snow-sure in at least 9 of the last 11 winters, meaning mid-mountain had 30 cm or more of modelled natural snow on at least 90% of days.
Month by month
October: 0 of 2 snow-sure. Surest: Zermatt (1 of 11).
November: 0 of 2 snow-sure. Surest: Zermatt (4 of 11) and Verbier (2 of 11).
December: 1 of 2 snow-sure. Surest: Zermatt (10 of 11) and Verbier (8 of 11).
January: 2 of 2 snow-sure. Surest: Zermatt (10 of 11) and Verbier (10 of 11).
February: 2 of 2 snow-sure. Surest: Zermatt (11 of 11) and Verbier (11 of 11).
March: 2 of 2 snow-sure. Surest: Zermatt (11 of 11) and Verbier (11 of 11).
April: 2 of 2 snow-sure. Surest: Zermatt (11 of 11) and Verbier (11 of 11).
May: 2 of 2 snow-sure. Surest: Zermatt (11 of 11) and Verbier (10 of 11).
June: 0 of 2 snow-sure. Surest: Zermatt (7 of 11) and Verbier (1 of 11).
July: 0 of 2 snow-sure. Surest: Zermatt (1 of 11).
Resort by resort
Verbier, Switzerland, 1,500–3,330 m: snow-sure January to May.
Zermatt, Switzerland, 1,620–3,883 m: snow-sure December to May.
Questions
When is the best time to ski in Switzerland?
For natural snow, January to May. That is when the most resorts Cirque models in Switzerland have been snow-sure over the last 11 winters.
When does natural snow become reliable in Switzerland?
The first month in which any resort Cirque models here was snow-sure in at least 9 of 11 winters is December. Resorts open on their own dates and many use snowmaking earlier.
Which resort in Switzerland has the most reliable snow?
Of those Cirque models, Zermatt: mid-mountain was snow-sure in 6 months of the year.
Does this include snowmaking?
No. These are modelled natural snow figures only, from ERA5 weather. Groomed pistes with snowmaking often ski better than this.