- Elevation
- 1,650 m at GangtokTsomgo 3,753 m · Nathu La 4,310 m · Yumthang 3,564 m
- Climate
- Temperate to alpine15–25 °C summer in Gangtok, 4–12 °C winter
- Best months
- Mar — May, Oct — DecSpring for flowers, autumn for clarity
- Monsoon
- Jun — SepNH10 can close at short notice; keep spare days
- Nearest airport
- Bagdogra (IXB)124 km, about 4.5 hours. Pakyong (PYG) is closer but has few, weather-dependent flights
- Nearest railway
- New Jalpaiguri (NJP)117 km, about 4.5 hours
- Road access
- NH10 along the TeestaEntry checkpost at Rangpo
- Ideal length
- 6 — 8 daysNorth Sikkim needs two nights minimum to acclimatise
- Languages
- Nepali, Bhutia, Lepcha, Hindi, EnglishEnglish widely understood
- Currency
- Indian Rupee (₹)ATMs in Gangtok; carry cash beyond it
- Mobile & internet
- Good in GangtokLittle or none in North Sikkim and at the passes
- Permit
- Inner Line Permit + protected areasSee the permit panel below