Trekking is possible through out the year. However the best seasons for trekking are either side of the monsoon season. Mid March to mid June and Mid September to Mid December are the best. During this time the weather is generally fine and the skies clear. Beside this season, it is possible to trek in other season,however we can expect lots of rain (and leeches) during the monsoon and severe cold and closed passes during the winter months. Rain shadows areas like Annapurna Circuit, Upper Mustang are recommended trek during monsoon season & Lower altitude treks like Ghorepani, Langtang Valley, Namche, Helambu are recomended trek during winter season..
Read more..A trekker should have a trekking permit issued by the Department of Immigration is required to trek in any part of Nepal, except the most popular areas of Annapurna, Everest and Langtang/Helambu. These areas were declared permit-free in 1999. For the Annapurna, & Langtang region trekkers require to have an entrance permit of Annapurna Conservation Area Project (ACAP Permit)Rs3000, Everest National Park Permit Rs 3000 & Langtang National Park Permit Rs 3000 Rupees along with TIMS Card (Trekking Information Management System). Everest has to pay for a local permit for rs20..
Read more..