At which times of year can one go walking in the mountains?

The season starts at midsummer and keeps on through into September. High season is between about 20 July and 10 August. There are a lot of people in the cabins then, and in some places it can get a bit crowded. Winter season begins at New Year. Most mountain stations, however, open in February and remain open until the beginning of May. Mountain cabins open in late February/early March and are open until the beginning of May.