How serious is the altitude at Bhairab Kunda?
Take it seriously. The lake is at about 4,250 m and the climb from the villages is large. Do not rely on claims that altitude sickness is not a risk here. Take the rest day, sleep low when you can, and go down if symptoms get worse.
Does the rest day at Khani Gaun really matter?
Yes. The sample itinerary builds in a rest or acclimatisation day at Khani Gaun before the higher camps, and it is the main protection before the long climb. Use it properly by resting, drinking well and short easy walking, rather than rushing ahead to save time.
What should I do if I get a headache before reaching Pati?
Stop climbing, rest and drink water, and tell your guide straight away. If the headache eases after a night's rest you can usually continue slowly. If it worsens, or you feel sick, unsteady or breathless at rest, descend. Do not climb on with symptoms to reach the lake.
How cold will I be at the lake camp?
Cold, even in autumn. Temperatures fall quickly in the evening, and you usually camp at the lake, so you need a sleeping bag rated for freezing nights, a sleeping mat and warm layers. Keep your sleeping bag dry in a dry bag, because a wet bag is the most common way a camping trip turns miserable.
Is it safe to drink the water on this route?
Treat all water. Carry a water filter or purification tablets, and use them for streams and tap water in villages. At the lake itself, keep soap and washing well away from the water, because it is a place of worship and a source for others.
What weather risks should I plan for?
The monsoon (June to August) brings heavy rain, slippery trails and road blockages, and the fair falls in that period. Winter is cold with snow higher up. Bring waterproof jacket and trousers even outside the monsoon, boots with good grip for steep muddy paths, and allow spare time.
Can I walk this route without a guide?
It is not advisable. Take a guide who knows the route, because the trail is less used and less marked than on the popular treks. Some paths are steep and muddy, and a guide can also help with permits, camps and any altitude problems.
