There are four season holiday in Nepal, however the best season to visit Nepal is either in Autumn season (Mid September to early December) or in Spring season (Early March to mid May). Autumn season is consider the best season for trekking tours in Nepal. During this period of months have pleasant climate condition not so hot and cold and visibility of mountain are clear. There is another best season of trekking Nepal after winter when sun getting more warmer in spring time may trekkers to Himalayas can again enjoy comfortable climate condition. In spring season in Nepal many different types of flowers bloom both trees and ground and it is also the best time mountaineering and climbing.
Autumn season is considered as the best trekking season for the trekking in Nepal. September, October and November are fall in this trekking season in Nepal. It offers excellent weather and tantalizing mountain views. Temperature is moderate, making it a good time for any trekking. The sky is generally clear with outstanding views. Occasionally short storms may dump considerable snow at high altitudes
Generally, the days are clear in winter season in Nepal. December, January and February months are cold days in mountain. In winter season in Nepal is usually snow fall in the higher elevations with risk winds and colder temperatures. Hence is ideal for trekking in the lower elevation. If you are looking for suitable and incredible scenery, this is a great time to Trek in lower elevations.
Spring season in Nepal is also considered as the best season to do the trekking and mountain climbing. In this season offers different varieties of wild flora blossoming of the giant rhododendrons above 3000m and hunting paradise during this season, which makes higher altitude trekking more comfortable and interesting. It is mildly warm at lower elevations and quite moderate temperature at higher elevation over 4000m, which provides spectacular and excellent mountains View. March, April and May months are fall in this trekking season in Nepal
June, July and August months are main rainy season in Nepal and involves monsoon with heavy rainfall which makes trekking conditions unfavorable. This season is ideal time for Trekking and tour to Tibet however, in some Trekking regions of Nepal connecting to Tibet and desert parts of Nepal like upper Mustang, Annapurna circuit, Nar-Phu valley and Dolpo regions are best season to do trekking which is summer trekking a great alternative behind the Himalayas rain shadow area