Khangchendzonga National Park

April to May and August to October are the best months for visiting  the park. Snowfall is heavy in winter and monsoon showers exist from May to mid October. To enter the National Park and Sanctuaries, permission of the State Chief Wildlife is required and this can be obtained on payment of entry fees.

Trekking
Yuksom (145km from the capital Gangtok) in West Sikkim is a starting point for trekkers and mountaineers. They can get a permit from the Wildlife Education and Interpretation centre at Yuksom or from the checkpost. State Tourism Department and other travel agents organise treks to Dzongri (4050 m), a two day trek from Yuksom. The trek routes are (a) Yuksom - Tshoka - Dzongri  (b) Bakim - Dzongri - Thangshing - Samuteng - Goechala  (c) Dzongri Base Camp - Rathong - Khangerteng (d) Thangshing - Lam Pokhari - Kasturi Orar - Lapdong - Tashiding (Road Head).

Lachen a village in North Sikkim is another starting point for a trek to Green lake which takes four to six days to reach through treacherous routes. Foreign nationals would require a restricted area permit from the Ministry of Home Affairs, Government of India, Delhi to visit areas in this part of the region. Indian nationals are required to obtain an Inner-Line Permit from the State Home Department. Permission of the State Chief Wildlife Warden is also mandatory. The routes are (a) Lucanes Jakchen-Yabuk-Rest Camp (Marco Polo Camp) - Green Lake (b) Lachen-Thasngu (13,695') Muguthang (16,000') - Thay La (17,000') - Khyoksa La (18,000') Rest Camp-Green Lake. Muguthang holds the famous annual Yak race.