The monsoon pilgrimage: Gosaikunda's Janai Purnima falls on August 28
Each year tens of thousands climb to the sacred 4,380m lake of Gosaikunda for the full-moon festival of Janai Purnima. In 2026 it lands on Friday, August 28 — and you can walk it as a trek.
While most of Nepal sits under monsoon cloud in late August, one high mountain lake comes alive. Gosaikunda, a sacred glacial lake at 4,380 metres north of Kathmandu, draws tens of thousands of Hindu and Buddhist pilgrims each year for Janai Purnima — the full-moon "sacred thread" festival. In 2026 the festival falls on Friday, 28 August, and for trekkers it is one of the most extraordinary cultural experiences the Himalaya offers.
Key facts
- Janai Purnima 2026: Friday, 28 August (full moon of Shrawan)
- Gosaikunda lake sits at 4,380m in Langtang National Park
- Tens of thousands of pilgrims make the climb each year
- Classic trekking itinerary: about 7 days
What is Janai Purnima
Janai Purnima, also called Raksha Bandhan, marks the day when Hindu men of the Brahmin and Chhetri communities ritually change the janai — the sacred thread worn across the body — after a purifying bath. At Gosaikunda, the act takes on epic scale: pilgrims trek for days and then bathe in the icy lake on the full-moon morning, believing the waters wash away sin. Shamans and jhankris dance through the night, drums echoing across the water. The purnima (full-moon period) in 2026 begins on the morning of 27 August and runs into the 28th, so the lakeside fills the day before.
Walking the pilgrimage
The beauty of Gosaikunda is that the pilgrimage is also a superb trek, and it sits in a part of the Langtang region that handles the monsoon better than most. The classic route climbs from Dhunche or Sundarijal through rhododendron and oak forest to Sing Gompa, then up to the lake basin — a string of more than a hundred glacial lakes scattered across the high country. A typical itinerary runs about seven days, and timing it to reach the lake by 27–28 August lets you witness the festival at its peak.
| Detail | Information |
|---|---|
| 2026 festival date | Friday, 28 August |
| Lake altitude | 4,380m |
| Region | Langtang National Park |
| Trailheads | Dhunche / Sundarijal |
| Trek length | ~7 days |
A few honest words on altitude and weather
This is a high-altitude trek done in the rainy season, and both facts deserve respect. The climb to 4,380m is rapid by pilgrimage standards, and altitude sickness is a real risk for the unacclimatised — pace matters more than the calendar. The lower forest sections can be wet, muddy and leech-prone, and afternoon cloud is the norm. Going with a guide who knows the trail, the teahouses and the festival crowds turns a potentially gruelling pilgrimage into a once-in-a-lifetime one.
What this means for you
If you want to combine a real Himalayan trek with one of Nepal's most vivid living rituals, plan a Gosaikunda trek that puts you at the lake on 27–28 August 2026. Book early — teahouses fill fast around the full moon — and let us handle the permits, acclimatisation schedule and a guide who can read both the weather and the ceremony.
For trekkers who have done the famous autumn trails and want something deeper, Janai Purnima at Gosaikunda is the trip that stays with you: a high sacred lake, a full moon, and thousands of pilgrims who walked the same path you did, for very different reasons.
Source: Best Heritage Tour; HopNepal; Above The Himalaya.
Cover photo: Sergey Pesterev via Wikimedia Commons (CC BY-SA 4.0).
Source: Best Heritage Tour
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