The Bagini Glacier trek reaches its high point on day 6, at Changabang base camp (4,600 m). The day starts at Upper Bagini base camp (4,400 m), well before sunrise, with a walk up the glacier's edge. The aim is to be there when the first light touches Changabang, one of the steepest peaks of the Garhwal, on the rim of the Nanda Devi Sanctuary.
You then spend the morning around the base camp, and start the long descent. The route goes back the way you came, mostly downhill, ending at Dronagiri (3,700 m), where the tents are pitched for the night. It is a big day, so we plan the whole of it around the early start and a steady return.
Changabang, 6,864 m. The peak stands beside Dunagiri (7,066 m), Hardeol (7,151 m), Rishi Pahar (6,997 m) and Saf Minal (6,911 m) on the rim of the sanctuary. Climbers know it for its steep granite walls. You are not climbing here: this is a trek to the foot of the mountain, and the reward is the view of it.
Light on Changabang is best in the first hour of the day, which is why the day starts in the dark. Bring a good headlamp and warm layers for the wait at the top.
Why the order of days matters. By day 6 you have slept at 4,200 m and 4,400 m, so the walk to 4,600 m is a small step up, not a jump. Day 5, from Lower to Upper Bagini base camp, is the exploration day that sets this up.
The sun and the temperature change quickly at this height. Temperatures along the route range from about 2 to 20 °C, and mornings at the base camps are the coldest part of any day.
If you want a summit rather than a base camp, look at the Pangarchula Peak trek. Tell us your dates and how you walk at height, and we will say whether Changabang base camp suits you.