Trekking activities can be done for the whole year in Nepal. However, there are some selective seasons in Nepal for such activities. Autumn and spring are the best seasons for the most of the trekking in Nepal. The weather is clear during autumn. The days are warm and nights are cold. Mountain views are crystal clear and it is appropriate to trek in the high altitude.
In the spring, the mornings are usually clear, but it can be cloudy and occasionally rain around evening. It is another best season for the travel activities. As there is less snow in the mountains, it is suitable for the high passes trekking and peak climbing. Various flowers blossom in this time, especially that of Rhododendron. The whole area becomes colorful; this attracts the trekkers to spend more times. Monsoon is another season for trekking, especially in the Himalayan rain shadow areas like Mustang, Dolpo, Nar Phu Valley and some other regions, including the treks in Tibet.