Trekking is possible any time of the year depending on where you are going. The popular seasons are spring and autumn. During winter, trekking is possible at lower altitudes. During the monsoon season, you can trek in the rain shadow areas north of the Himalaya like Mustang, Upper Mustang, and Dolpo. These places are out of reach of the rain clouds because of the high mountains and are unaffected by the monsoon.
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