September- November, and March-May mark the peak season for trekking in Nepal. The temperature is bearable with the stable weather during these seasons. So, it is the best time to go trekking in Nepal.
There is no need to wait for the peak seasons though. Because of Nepal’s diverse geography and changing climates, trekking in Nepal is possible throughout the year. You may not exactly go where you want to trek, but good options are available all year long.
Trekking in Autumn Season (September to November)
Autumn is the best season to trek in Nepal.
Most of the trekkers come to Nepal to trek to the high mountains. Especially when the weather is good and the views are awesome. Such is the time of Autumn season.
Most of these trekkers go to Annapurna and Everest. Recently, people trekking to Manaslu has increased as well. This is also the time to trek to Kanchenjunga, Langtang, Ganesh Himal and Makalu.
Any trekking that takes you over snowy passes at an altitude of 4000/5000m or more is doable during the dry and temperate season of autumn and spring.
Also, the main attraction of these treks is the majestic Himalayas. And the clear sky of this time accommodates a spectacular view of the Himalayas.
Even in autumn, October is the busiest.
Trekking in Spring Season (March to May)
Spring is another best time to go trekking in nepal.
It starts to get hot and hazy late in May. Still, not a bad time. At other times, the cloudless sky offers a clear view. The dry and moderate temperature of this season makes trekking to high altitude possible.
Thus, treks like Annapurna Base Camp Trek, Manaslu Circuit Trek, Everest Three Passes Trekking, Tsum Valley Trekking etc. are possible during this time.
The best part about Spring trekking are the colorful flowers that cover the hills and roadways. They make walking a very pleasant experience.
The number of trekkers is highest in March. It starts to dwindle by May and only a few trekker treks during early monsoon. In comparison to autumn, spring sees lesser trekkers.
Trekking in Summer/ Monsoon Season (June to August)
Monsoon means rain and clouds. Not a good time if you want to see the mountains. The paths will be muddy, slippery and landslides and avalanches may occur. Leeches fall on you from trees as well.
So, where to trek in Nepal during the summer/ monsoon?
The description above is true for most of the trails. However, the rain shadow areas at north can are trek-able throughout the year. These places receive very less to no rainfall.
Humla, Jumla, Simikot, Nar Phu Valley, Dolpo, Mustang are some regions or places in Nepal that you can trek during monsoon.
Actually, summer is the best time to trek to these places as the temperature is most pleasant and moderate.
Trek to Muktinath, Jomsom is also possible during monsoon. It remains dry in all seasons except in winter. Snow falls in winter.
Another good option is to trek to Tibet. Many Travel Agencies in Nepal offer treks to Tibet as well.
Trekking in Winter Season (December to February)
Winter is not really a bad time for trekking. The air is dry and the sky is clear. The only problem is the cold.
Higher altitude trekking becomes difficult by the cold, snow and snow storms. Treks that contains passing over high passes are not recommended.
In winter, one can trek to lower regions. The northern part of Nepal like Dolpo, Mustang, Humla, and others are accessible too.
A temperature at higher altitude is much colder during winter than any other season. This is why people trek during spring and autumn instead when the temperature is tolerable.
Even then, because of its popularity, Annapurna and Everest receive a handful of trekkers. And because of this, some lodges remain open. Though, lodges at Gorak Shep may be completely closed. So, it is good to pre-book for accommodation and food before you begin the trek.
A straight trek to Everest Base Camp and back is doable, instead of Three Passes or other trails that go around. Trekking in Annapurna region during winter is possible but the high passes like Thorang La Pass may not be possible to pass due to heavy snow.