Yoksum and Zongri are two places in West Sikkim between which there is a proper well beaten trekking track in the form of a bridle path. The best time to venture on a trek on this route is April to June and September to November. Tourism Department organises treks during autumn and spring. Till Yoksum there is a motorable road. To reach Yoksum, one must first come to Gyalshing from Gangtok or Jorethang from where regular bus services are available. From Gyalshing to Yoksum, one can either travel by bus or taxi. If traveling by own vehicle, one may opt to reach Yoksum via Tashiding taking the bifurcation road from Legship. Besides having many trekker’s huts, Yoksum also has a private hotel which provides both boarding and lodging. Guides, porters and pack yaks are readily available at Yoksum. Tents, sleeping bags and other trekking equipment are also available for rent at Yoksum.
Yoksum was the first capital of Sikkim and it was here that the first Chogyal was consecrated by the three holy Lamas. The spot where this ceremony took place in 1642 can still be seen here. Overlooking Yoksum and about half an hours walk uphill is the Dubdi monastery one of the oldest in Sikkim.
The walk to Zongri begins with the track skirting meadows and meandering past huts. After an hour of a flat track which is crossed by small foot or two wide streams whose waters seem to be in a hurry to meet the river below, the climb begins. A walk of another four hours on a path lined with sky embracing trees and carpeted with leaves falling from the surrounding vegetation takes you to Bakim which has a trekker’s hut. A further one hour climb and you are at Bakim. You may opt to halt at Chokha which also has a trekker’s hut. Chokha itself is a small village consisting of about a dozen houses and a monastery. To cater to the tourists, most of these houses offer accommodation and food at a nominal cost.
The walk between Yoksum and Chokha takes about six hours but would vary considerably with the trekker’s stamina. In a distance of about 16 kilometres one has climbed from Yoksum at 1780 m(5840 ft) to Choka at 3006 m (9860 ft)
Another steep climb of 10 kilometres which takes about 4 hours and you are at Zongri at 4030 m (13220 ft). Zongri has two trekker’s huts and hardly any other habitation. From the Zongrila pass about an hour’s walk from the trekker’s huts, the view of the mountain ranges is heavenly. In front of you is the Kabur Dome and piercing the sky is the Mount Pandim. Mount Kanchendzonga with its accompanying peaks towers over you in the North.
At Zongri the bridle path ends and bifurcates into two footpaths: one leading to the Base Camp and the other to the Goechela pass. The base camp at 4573 m (15000 ft) is 9 kilometres away and takes about three hours for the average trekker to reach.The Base camp which consists of a number of trekker’s huts is owned by the Himalayan Mountaineering Institute, Darjeeling which conducts a number of mountain climbing courses every year. The Frey Peak, Koktang, Kabru and Rathong look ominously close from here and tower above the HMI camp.
On the other route the Goechela pass at about 4942 m(16210 ft) is about 14 kilometres via Thangsing, Samiti Lake and Zemethang.