Why people come in winter
The white Silk Route is a different trip. After a fresh fall the zig-zag above Zuluk is drawn in snow, the Nathang plateau turns into a frozen basin ringed by white ridges, and the sky on clear days is a deep, hard blue. Kupup's Elephant Lake freezes, yaks stand in the snow by the road, and the only sounds are wind and prayer flags. For many travellers from the plains it is their first real snow, reached in a day's drive from NJP.
Winter also asks more of you. Temperatures at Nathang fall to around −10 °C at night in January and can go lower; water freezes in the pipes; the road can close without warning; and the days are short. None of this is a reason to stay away. It is a reason to plan with more slack, choose your nights carefully, and travel with a driver who has done the road in snow many times.
Winter also has practical advantages. Outside the Christmas–New Year week the route is quieter than in October, homestay rates are normal, and the skies on clear days are among the sharpest of the year. Many photographers prefer late January and February for exactly these reasons.
When the snow comes
Snow follows altitude and the weather systems that come in from the west in winter. Kupup and Nathang, at about 4,000 m, usually get their first lasting snow in December, sometimes late November, and stay white into March. Thambi, Lungthung and the upper loops get heavy falls in January and February. Zuluk, at about 2,900 m, gets snow most winters in January and February, though it may melt within days. Padamchen and Lingtam lower down see snow only rarely.
No month is guaranteed. Some Januaries are dry and cold with only old snow on the ground; some Marches bring the heaviest fall of the year. If seeing snow is the whole point of your trip, aim for mid-January to late February and keep your dates flexible.
The temperatures in the table are rough typical ranges to help you pack, not records. A clear, windless night at Nathang in January can be colder than shown, and a cloudy one milder. Wind chill at Thambi and Kupup makes even a sunny noon feel bitter.
| Month | Zuluk (2,900 m) | Nathang (≈ 4,000 m) | Snow chance | Road risk |
|---|---|---|---|---|
| November | ≈ 2 to 12 °C | ≈ −6 to 6 °C | Low at Zuluk, some at Nathang | Low |
| December | ≈ 0 to 10 °C | ≈ −10 to 3 °C | Moderate up high | Moderate |
| January | ≈ −3 to 8 °C | ≈ −15 to 0 °C | High up high, good at Zuluk | High |
| February | ≈ −2 to 9 °C | ≈ −12 to 2 °C | High | High |
| March | ≈ 2 to 12 °C | ≈ −8 to 5 °C | Moderate, late falls possible | Moderate |
Closures, clearing and the spare day
The road from Rongli to Kupup is kept open for the Army, and the Border Roads Organisation clears it after snowfall, usually within a day or two on the main stretches. Before clearing, though, the posts may stop tourist vehicles above Zuluk or above Nathang. After a heavy fall the high road between Nathang, Kupup and Tsomgo can stay shut for longer, so any winter plan that crosses to Gangtok over Kupup needs a fall-back via Rongli.
We build every winter Silk Route trip around one spare day. If the road above Zuluk is shut on the day you planned for Nathang, you wait a day at Zuluk, or switch to Padamchen and Aritar and try again. If you have a flight from Bagdogra the day after the trip, a closure can become a missed flight; keep a gap. Check current status before you travel and again the evening before each high day; your homestay and driver will know.
We turn this into a priced, day-by-day plan for your dates.
Cars, chains and the driver's call
Winter is the season to pay a little more for the right vehicle. Bolero, Scorpio and similar high-clearance vehicles are the standard on snowy stretches; small hatchbacks are fine to Zuluk on dry days but struggle on ice. Experienced Silk Route drivers carry snow chains in winter and fit them on the steep loops when needed. Fitting takes time, so expect stops.
The most important rule is to accept your driver's decision. If they say the road above Thambi is too icy, or that they will wait an hour for the sun to soften the surface, they are thinking about your safety and their livelihood at the same time. Pushing a driver to continue in bad conditions is how winter accidents happen. If you want a second opinion, ask your homestay host, who will know what the road was like that morning.
What to pack
Cold at 4,000 m is dry and windy, and homestays have limited heating. Layering works better than one heavy jacket.
- Thermal inner wear, top and bottom, one set to sleep in
- A fleece or woollen middle layer and a down or padded jacket
- Windproof outer layer; Thambi and Kupup are very windy
- Warm cap covering the ears, gloves, and a scarf or neck gaiter
- Woollen socks and waterproof shoes with grip; snow boots can be hired at Kupup
- Sunglasses with UV protection: snow glare at altitude is strong
- Sunscreen and lip balm
- Hot-water bottle, torch and power bank, since power cuts are common
- Personal medicines, plus anything your doctor advises for altitude
- A refillable bottle and a flask for hot water
- A small daypack with snacks, water and a spare warm layer for the long drive over the high road, in case you wait for snow clearing
- Cash for the whole trip: there are no ATMs above Rongli
Altitude and cold together
Cold makes altitude harder. You breathe faster, drink less because water is icy, and sleep badly under heavy quilts in a cold room. In winter we are stricter about our usual rule: never sleep at Nathang on your first night in the hills, and give families with young children, older parents or anyone with a heart or lung condition two nights at Zuluk with Nathang and Kupup as a day trip.
Drink warm water steadily through the day, eat a proper dinner, avoid alcohol at height and keep your head and feet warm at night. A mild headache usually passes with rest and water. Vomiting, confusion, unusual breathlessness at rest or a headache that does not ease with a painkiller mean go down, that night if possible. Hypothermia is the other winter risk; wet clothes and wind on the high road are a bad combination, so change out of damp layers quickly.
A sensible winter plan
Our most popular winter route is four nights from NJP: Aritar or Padamchen for the first night, two nights at Zuluk, one at Nathang if the road and the group allow, and a long drive back to NJP. That gives two chances at Thambi and Nathang, and a built-in spare day if snow closes the road. From Gangtok, a three- or four-night plan using Zuluk as the base works well, with Nathang and Kupup by day.
Book homestays with attached bathrooms and room heaters, and confirm water supply with your host, because in a hard freeze some houses carry water. Expect car rates to rise by ₹500–1,000 a day for a bigger vehicle in snow. And keep your expectations open: a winter day that turns out clear and cold rather than snowy still gives you frozen lakes, white ridges and the sharpest views of the year.
Rules, fees, fares and road status change often. Check current status before you travel.
