One of the best trekking seasons in Himalayas Nepal start mid September to mid-December and March to May after three month unfavorable rainy season called Monsoon in June, July and August. Last of December, January and February is best season for those mountain lovers avoiding touristic in Himalayas can trek in cold weather specially celebrating Christmas and year in Himalayas.
June, July and August involves heavy monsoon rainfall makes uneasy and wet. However best deal time for trekking tours in Tibet behind the Himalayas unreachable of rain is safe and enjoyable as well Upper Mustang Trek part of Lo-Manthang, Narphu Valley as well popular Everest Base Camp
Nepal Best Trekking Season generally known after monsoon falls and winter. The month of mid September to December Autumn season and mid February to May spring season just before heavy rain falls. During the period of these month have best pleasant climate condition not cold and hot clear visibility of air and mountains peaks. Another best spring season last of winter when sun getting day by day warmer may trekkers to Himalayas region can enjoy very comfortable climate with blooming rhododendrons Nepal national flowers both trees and ground as well peak climbing and mountain expeditions.
September-October-November and December (autumn) is considered as first best trekking season in Nepal. During time offers excellent tantalizing panoramic mountain views. Moderated temperature with clear blue sky, occasionally short storms may dump light snow at high altitude passes making it good time.
January-February (winter) generally during the winter from last week of December to last week of February months is coldest days in mountain. Usually snow fall in the mountains above the higher elevation a bit risk of winds and colder temperatures. Hence is best deal for treks in lower elevation. If anyone looking for suitable and incredible sceneries will be great time trek in lower elevation.
March-April and May (spring) The rhododendrons trees and ground flowering spring season also considered best season after autumn to do the trekking and mountain climbing offers different varieties of giant rhododendrons above 2500m and wild blossoming flora hunting paradise during the season, makes higher altitude trekking route much comfortable and very interesting. Providing excellent colorful view in front of the giant snow capped peaks.
June-July and August (summer) one of the heavy rainy seasons in Nepal mountain start from June, July and August involves moving monsoon rainfall makes unfavorable conditions for trekking. If you deal time for this season however Upper Mustang Trek, Upper Dolpa Trek and Upper Annapurna with Hidden Valley Nar-Phu region are best to do with great alternative behind the Himalayas rain shadow.