The Chadar Trek follows the frozen Zanskar river near Leh, usually walked in January and February when the ice sheet is thick enough. It is tightly regulated: trekkers need a medical clearance, a wildlife permit, and a no-objection certificate arranged through a registered operator and the Ladakh administration. Leh’s winter flights run only in the morning and are frequently delayed by weather, so plan accordingly.
Updated October 2026 · HappyFares
Few treks in India demand as much respect for altitude, cold and official process as the Chadar. Here is what currently governs it, and how winter flights to Leh factor into your planning.
When does the Chadar Trek run, and why is the window so narrow?
The Chadar, literally “sheet” in Hindi and Urdu, refers to the ice that forms over the Zanskar river in the gorge below Leh. It is only walkable once the river has frozen thick enough to bear a trekker’s weight in continuous stretches, which generally happens through January and into February. The exact start and end shift with that winter’s temperatures, so operators finalise departure batches closer to the season rather than fixing dates far in advance. Confirm actual departure windows for 2027 with a registered operator or the Ladakh administration rather than relying on a fixed calendar date.
What permits and medical checks does the Ladakh administration require?
Since 2018, the Chadar has been regulated through the All Ladakh Tour Operators Association (ALTOA), working with the Leh district administration. Trekkers cannot go independently: you must book through a registered operator affiliated with ALTOA, who arranges the No Objection Certificate that is mandatory for every participant. A medical fitness clearance is also required, and a wildlife department permit applies since the trek passes through Hemis National Park’s buffer area.
A single-window arrangement at the Tourist Information Centre in Leh is where the medical check, insurance and rescue registration, wildlife permit and ALTOA clearance are typically processed together. Requirements, fees and the exact paperwork sequence have changed over past seasons and are set by the Ladakh administration and ALTOA, not by trek operators individually, so verify the current process, any age limits, and the specific documents needed directly with ALTOA or your operator before you commit to dates or flights.
How many days in Leh do you need before starting the trek?
Leh sits well above 3,500 metres, and altitude sickness is a real risk if you rush straight onto the ice after flying in. Trek operators commonly build in acclimatisation days in Leh before the Chadar begins, and the exact number of mandatory days, along with the current medical screening process, is set by the Ladakh administration and is the kind of detail that can change between seasons. Treat any acclimatisation schedule you read online as a starting point, and get the current requirement confirmed in writing by your operator or ALTOA before you lock in flights, since arriving a day short of what is required can mean being held back from the trek.
How reliable are winter flights to Leh?
Leh’s Kushok Bakula Rimpochee Airport sits in a mountain bowl, and winter flights there operate almost exclusively in the morning, when the air is calmer; afternoon winds and the thinner mountain air make later departures and arrivals far less practical. Morning fog over the plains can also delay or cancel the earliest flights out of Delhi or other gateway cities, which can cascade into missed Leh connections. Booking the earliest realistic morning flight, and keeping at least one buffer day before your trek’s official start, reduces the chance that a weather delay costs you your acclimatisation window or your trek slot entirely.
Common Questions
Can I do the Chadar Trek independently without a tour operator?
No. Since the ALTOA regulation came into effect, every trekker needs a no-objection certificate arranged through a registered operator; solo or independent treks are not permitted.
Do I need prior trekking experience for the Chadar?
It helps, but is not always mandatory. What matters more is passing the required medical fitness check, since the combination of extreme cold and altitude is demanding even for fit trekkers. Discuss your fitness and any health conditions with your operator and the examining doctor.
What is the best way to fly into Leh for a winter trek?
Book the earliest available morning flight from your gateway city, and build in at least one spare day before the trek’s scheduled start in case of weather delays.
Is the Chadar Trek dangerous?
It involves walking on river ice in sub-zero temperatures, which carries real risk, including thin ice in places and extreme cold exposure. This is exactly why medical clearance, registered operators and official permits are mandatory rather than optional. Always follow your operator’s safety briefing and the Ladakh administration’s current guidelines.
Can children or senior citizens do the Chadar Trek?
Age limits and fitness requirements are set by the Ladakh administration and ALTOA and have varied between seasons. Check the current age and fitness criteria with ALTOA or a registered operator before planning for younger or older trekkers.
What should I pack that is not obvious?
Beyond extreme cold weather gear, most operators recommend footwear with good grip for ice, and insist on specific personal medical items. Your registered operator will issue a detailed packing list once your dates and medical clearance are confirmed.
Is the Chadar Trek affected by the Nallah Padam Dras road project?
Construction work connecting Zanskar to the rest of Ladakh by an all-weather road has been under discussion for years and could eventually change how the region is accessed in winter. For now, treat the Chadar as the current route and check with the Ladakh administration or ALTOA for any updates before you finalise plans.
Flying to Leh for the Chadar Trek? Search flights on HappyFares and pick the earliest morning departure for the best shot at a smooth winter connection.
Chadar Trek permits, medical rules, acclimatisation requirements and fees are set and revised by the Ladakh administration and ALTOA; confirm current specifics with them or your registered operator before you travel.
