Day 1: Gantok - Lachen (130 km, 5hrs)
A drive to the starting point of the trek Lachen. Rest and acclimatize for the trek.
Day 2: Lachen (2730 m/8950 ft) - Tallem (3240 m/ 10620 ft)( 12 kms/ 5-6 hrs)
We start day 1 with walk towards Zema. At Zema there is confluence of Zemu Chu and Thangu Chu. After crossing a bridge the trail turns towards the west to follow the left bank of the Zemu Chu to Green Lake. The trail for the first 6 kms is wide and broad .Sometimes the route is hampered with landslides. After a further 6 kms we reach Tallem , at the confluence of Lhonak Chu with Zemu Chu. Overnight stay in tents.
Day 3: Tallem - Jakthang (3430 m/11250 ft) ( 12 kms/ 5-6 hrs)
On day 2 the trail enters some of the most magnificent forest areas for which Sikkim is famous. Cross a bridge to climb steadily through forest to Shobuk. The trail then descends steeply for 12 kms to Jakthang, a small clearing in the forest. Overnight stay in tents.
Day 4: Jakthang (3430 m/11250 ft)
Day is for rest and acclimatization.
Day 5: Jakthang - Yabuk (4040 m/13250 ft) ( 8 kms/ 4-5 hrs)
The trail continues through forest on this day. After a short climb it crosses a bridge over Thombak Chu. There are several ascents and descends on the route, and is often wiped out of floods. Later we descend towards the bank of the Zemu Chu and follow the trail beside the river. After a tiring 8 kms day walk we reach the camping ground of Yabuk, a small but beautiful camping area very cold and windy near the glacier. Overnight in tents.
Day 6: Yabuk - Rest camp ( 4725 m/15500 ft) ( 8 kms/ 3-4 hrs)
From Yabuk the trail enters the moraine field of the Zemu Glacier, crossing boulders and pebbles. It is a tiring route with increasing altitude and is like a walk in high altitude desert, though on later part one is rewarded with magnificent views of mountain peaks like Siniolchu and Simvu. At times one can also view Kangchenjunga rising in the distance. After a 6 kms walk we reach Rest camp at the Mouth of Lhonak valley. Overnight stay in tents.
Day 7: Rest Camp - Green Lake ( 4935 m/16190 ft ) ( 6 kms/ 3-4 hrs)
The trail from Rest camp towards the Green Lake is along similar terrain along a moraine ridge. The views of the surrounding peaks are very clear. Finally we reach Green lake camp which is a vast open ground. Overnight Stay in Tents.
Day 8: Green Lake (4935 m/16190 ft )
The day is for rest /acclimatization. Overnight stay in tents.
Day 9: Green Lake - Rest Camp (4725 m/15500 ft) (6 km/ 2-3 hrs)
Today we start retracing our steps towards Rest camp. Overnight stay in tents.
Day 10: Rest camp - Yabuk ( 4040 m/ 13250 ft ) ( 8 kms/ 3-4 hrs)
This day we trek back towards Yabuk with moderate pace and enjoy the beauty of the trek. Overnight stay in tents.
Day 11: Yabuk - Jakthang (3430 m/11250 ft ) ( 8 kms/ 3-4 hrs)
We continue to descend further towards. Jakthang. Overnight Stay in tents.
Day 12: Jakthang - Tallem (3240 m/ 10620 ft) ( 12 kms/ 4-5 hrs)
Today we start little early and continue towards Tallem. The trail is easy walk with ups and down. Overnight Stay in tents.
Day 13: Tallem - Lachen (2730 m/8950 ft) (12 kms/ 4-5 hrs) - Gangtok (130 km / 5 hrs)
On the final day we will trek towards Lachen. The route is generally downhill and is a easy walk. Start early to reach Lachen by 11 am. Drive back to Gangtok. Trip Ends here.