Nepal's geography runs from tropical lowlands in the Terai to arctic conditions on the highest peaks, so there isn't one single "best" time that applies everywhere. What matters is matching the season to what you actually want to do.
- Autumn (September to November): the most popular season, and generally considered the best all-around choice
- Spring (March to May): the second most popular season, close behind autumn
- Winter (December to February): workable for specific low-altitude treks and city or wildlife travel
- Summer/Monsoon (June to September): the off-season for most trekking, though a few rain-shadow regions stay dry
Autumn (September to November)
This is peak season for a reason.
- Skies are at their clearest, with the most reliable mountain views of the year
- Temperatures are mild and stable in the hills, though nights at higher altitude can still drop toward freezing
- Trails and tea houses are at their busiest. Book flights and permits well ahead of time
- Nepal's two biggest festivals, Dashain and Tihar, usually fall in this window, along with Indra Jatra
Good for: Everest Base Camp, Annapurna Circuit and Base Camp, Manaslu, Langtang, and most other major treks. Also the best season for wildlife safaris in Chitwan and Bardiya, since the monsoon has cleared and grasslands are easier to spot animals in.
Winter (December to February)
- Not the season for a long high-altitude trek, but far from a dead season.
- Higher elevations get genuinely cold, with heavy snowfall possible above 3,000 to 4,000 meters
- Flight delays and cancellations to mountain airstrips like Lukla become more common
- Lower and mid-altitude treks stay open and are considerably quieter than in autumn
Good for: Everest Panorama Trek, Everest and Annapurna helicopter tours, Ghorepani Poon Hill, Chisapani-Nagarkot, and Helambu. Also a strong season for Kathmandu Valley culture, since sites like Kathmandu Durbar Square, Swayambhunath, and Pashupatinath see far fewer crowds. Pack proper down layers regardless of which trek you pick.
Spring (March to May)
- Warming weather, blooming rhododendrons, and a slightly different set of trade-offs than autumn.
- Daytime temperatures climb steadily through the season, with mornings and evenings still cold at altitude
- Rhododendron forests bloom across the mid-hills, especially in Annapurna and Langtang
- Festivals like Holi and Buddha Jayanti fall in this window
Good for: the same major routes as autumn (Everest Base Camp, Annapurna, Manaslu), plus it's the preferred season for peak climbing and for helicopter tours, paragliding, and other air-dependent activities, since visibility tends to be strong.
Summer/Monsoon (June to September)
- The quiet season for most of the country, with one notable exception.
- Rain arrives most afternoons and can trigger landslides on exposed sections of trail
- Leeches are common on lower-altitude, forested routes
- Most major trekking regions are best avoided during this stretch
The exception: Upper Mustang, Dolpo, Nar Phu Valley, and parts of the Manaslu region sit in the Himalayan rain shadow and see little to no monsoon rainfall, which makes them one of the few good trekking windows for this time of year.
Good for: trans-Himalayan treks in the rain shadow, plus lower-cost travel generally, since this is Nepal's off-season and hotel and package rates tend to drop.
Choosing Based on What You Want to Do
- Best mountain views: autumn, followed closely by spring
- Fewest crowds on major routes: winter for low-altitude treks, monsoon for rain-shadow treks
- Festivals: autumn (Dashain, Tihar) or spring (Holi, Buddha Jayanti)
- Wildlife safari: autumn through winter, once the monsoon has cleared
- Budget travel: monsoon season, when rates are typically lowest