North Sikkim is the state's high-altitude side: Lachen and Lachung are the two gateway villages, reached along separate valleys, with Gurudongmar Lake and Yumthang Valley as the payoff for each. It works differently from the rest of Sikkim in one important way — you can't visit independently, permit or no permit.
Lachen and Gurudongmar Lake
Lachen is the base for reaching Gurudongmar Lake, a high-altitude lake at over 5,000 metres near the Tibet border. It's a long, cold trip — altitude sickness is a real concern at that elevation, and most operators build in an overnight in Lachen rather than attempting the lake as a day trip from Gangtok.
Lachung and Yumthang Valley
Lachung is the base for Yumthang Valley, known as the "Valley of Flowers" when rhododendrons bloom in spring, and for the Zero Point snow area further up the valley. This is the more commonly visited of the two North Sikkim legs, and the one most short operator itineraries prioritise if time is limited.
Permits, and why you can't just book a hotel and drive up
Beyond Chungthang, North Sikkim is a Protected Area, and a Protected Area Permit is required for everyone — Indian nationals included, not only foreign visitors — because of how close the region sits to the international border. The permit is arranged through a registered Sikkim tour operator as part of a package covering permit, vehicle, driver and accommodation; independent travel into the protected area isn't permitted regardless of nationality. Foreign nationals additionally need to travel in a group of at least two with a registered guide. Document requirements (and which ID types are accepted) have changed in the past, so confirm the current checklist directly with your operator or the Sikkim Tourism Department shortly before travelling rather than relying on an old trip report.
When to go
Spring (March–May) brings the rhododendron bloom to Yumthang Valley, its best-known season. Winter (December–February) can bring snow and road closures at higher points, including around Gurudongmar. October–November offers clear skies but colder mornings. As with the rest of Sikkim, the June–September monsoon carries landslide risk on mountain roads — see our month-by-month breakdown for the wider seasonal picture.
Getting there
All North Sikkim trips start from Gangtok, since that's where registered tour operators are based and where permits are processed — see our Sikkim travel guide for getting to Gangtok itself. From there, Lachen and Lachung are each roughly a full day's drive, in opposite valleys, which is why they're usually treated as separate legs rather than a single loop.
How much time to allow
Most operator itineraries run 2–3 days out of Gangtok, covering one or both valleys with an overnight in Lachen and/or Lachung. Because permits are issued per-route and processed close to departure, build in your Gangtok base days (see our Gangtok where-to-stay guide) before finalising the North Sikkim leg with your operator.
Frequently asked questions
Can Indian nationals visit North Sikkim without a permit?
No. Beyond Chungthang, North Sikkim (Lachen, Lachung, Yumthang Valley, Gurudongmar Lake) requires a Protected Area Permit for Indian nationals too, not just foreigners, because of its proximity to the international border. Rules and required documents change, so confirm the current checklist with a registered Sikkim tour operator before you travel.
Can I travel to North Sikkim independently, without a tour operator?
No. Entry to the protected area beyond Chungthang is only permitted through a registered Sikkim tour operator, who arranges the permit, vehicle and driver as a package. This applies to Indian nationals and foreigners alike, not just group tourists.
How many days do I need for North Sikkim?
Most operator itineraries run 2-3 days out of Gangtok, covering Lachen/Gurudongmar Lake and Lachung/Yumthang Valley as separate legs, since the two are a full day's drive apart and permits are usually issued per-route.
