Nathu La Pass was a major corridor of passage between India and Tibet before it was closed in 1962. Located around 56 kms from Gangtok at an altitude of 14450 ft, the road to Nathu La passes through the Tsomgo lake. It is one of the highest motorable roads .

Nathu La is a mountain pass in the Dongkya Range of the Himalayas between China's Yadong County in Tibet, and the Indian states of Sikkim and West Bengal in Bengal, South Asia. The pass, at 4,310 m, connects the towns of Kalimpong and Gangtok to the villages and towns of the lower Chumbi Valley.

Nathu La Pass experiences heavy snowfall during winter. The temperature of this area may drop down to -25 degrees Celcius. If you really love snow, you can visit Nathu La Pass in winter with thick woollen garments. May to mid-November is the summer season when the temperature ranges around 10 degrees Celcius.