When to trek in Nepal, season by season

Post-monsoon autumn is the season Nepal is famous for. The rains have washed the atmosphere clean, the haze that builds through spring has not yet returned, and the mountains are visible in a way they simply are not at other times of year. Nights are cold at altitude but daytime walking is comfortable at almost every elevation.

It is also stable. The weather systems that make spring afternoons unpredictable have largely gone, and multi-day windows of clear conditions are normal rather than lucky. For a trek where the whole point is the view — Everest Base Camp, Annapurna Base Camp, Poon Hill, Gokyo — this is when to go.

The cost is people. Every trekking agency in the world knows this, and October in particular concentrates an enormous share of Nepal's annual trekking traffic into a few weeks. Teahouses on popular routes fill, single rooms disappear, and the trail itself has a queue-like quality on the busiest sections.

Book accommodation and internal flights well ahead, and expect that a guide worth having is already committed. Late booking in October is how people end up with the guide nobody else wanted.

The festival overlap is the part that catches foreign trekkers. Dashain and Tihar sit inside this window and shift each year with the lunar calendar — in 2026 Dashain runs from 11 to 25 October and Tihar from 7 to 11 November, while in 2027 they fall earlier, Dashain from 1 to 15 October and Tihar from 27 to 31 October. Check the year you are travelling. During these weeks buses and domestic flights are heavily booked by Nepalis travelling home, and some staff will be away.

Late November is an underrated slot. The crowds thin sharply, the air is still exceptionally clear, and the cold has not yet become a real obstacle below the high passes. If your dates are flexible, this is often the best compromise available.

Spring is the second season and, for some routes, the better one. Temperatures are rising, the days lengthen, and the middle hills fill with rhododendron — which is genuinely spectacular and is a reason in itself to walk the Annapurna foothills or Langtang in late March and April rather than October.

It is also the mountaineering season, which changes the character of the Khumbu completely. Base camp is a working expedition site rather than a viewpoint, and the trails carry expedition logistics as well as trekkers. Whether that is atmosphere or intrusion is a matter of taste.

The trade-off is visibility. Haze builds through spring as dust and agricultural burning accumulate in the pre-monsoon atmosphere, and by late April and May the long mountain views that define autumn are frequently reduced. Mornings are better than afternoons; May is hazier than March.

Afternoon instability is normal. Building cloud and afternoon showers are common in spring, which is a good argument for starting early — a habit worth having in Nepal in any season, because mountain weather deteriorates through the day far more often than it improves.

Higher routes and passes are more comfortable in late spring than in autumn, because the accumulated winter snow has largely gone and daytime temperatures are higher. For treks whose crux is a high pass, this is a real advantage.

Spring is generally slightly less crowded than October on trekking routes, though the Everest region is busy for its own reasons. Accommodation pressure is real but less acute, and flights are easier to secure.

The summer monsoon is the season everyone tells you to avoid, and for most of Nepal that advice is correct. Trails are wet and slippery, leeches are abundant in the forested middle hills, mountain views are largely absent, and the risk of landslides and washed-out roads is at its annual peak.

The onset and withdrawal of the monsoon are announced each year by Nepal's Department of Hydrology and Meteorology and they vary — an early or late onset shifts everything, including when the shoulder weeks at either end become viable. If you are planning around the edges of the season, check what the department has actually said for that year rather than assuming fixed dates.

Road travel is the real hazard, more than walking. Landslides close highways, and long bus journeys through hill terrain in heavy rain carry a level of risk that has nothing to do with your fitness. If you must travel in monsoon, prefer flying over long road journeys and build slack into every connection.

The exception, and it is a large one, is the trans-Himalayan rain shadow. Upper Mustang, Dolpo and parts of Manang sit behind the main Himalayan range, which intercepts the monsoon before it reaches them. These regions are dry when everywhere else is soaked, and summer is genuinely their season — one of the few real secrets in Nepali trekking.

There are compensations elsewhere too. The hills are green in a way they never are in autumn, wildflowers are abundant, the trails are empty, and prices are soft. For a low-altitude walk where you are not depending on views, monsoon has something to offer.

Whatever you do, take the weather seriously. Monsoon in Nepal is not rain as a mild inconvenience; it is the season in which landslides and floods kill people every year, and the sensible posture is caution rather than stoicism.

Winter in Nepal is dramatically underrated for anyone willing to be cold. The air is exceptionally clear, the trails are quiet, teahouse owners have time for you, and prices are at their lowest. For low and middle-altitude routes — Poon Hill, the Annapurna foothills, Nagarkot and the valley rim, parts of Langtang — it is a genuinely good season.

The limiting factor is snow at altitude and the closure of high passes. The Thorong La on the Annapurna Circuit, the Cho La and Renjo La in the Khumbu, and Larke La on Manaslu can all become impassable or dangerous after snowfall, and a pass that is open one week may not be the next.

Cold at night is the practical difficulty rather than cold during the day. Teahouses at altitude in winter are unheated except in the dining room, and a sleeping bag rated for the temperatures you will actually encounter is not optional. People routinely underestimate this and have a miserable time for want of one item of equipment.

Some higher teahouses close for the season, and staff move down to lower villages or to the cities. That thins the infrastructure exactly where you most want it, so a winter trek at altitude needs a plan for where you will sleep rather than an assumption that something will be open.

Daylight is short, which compresses the walking day considerably. Starting at first light matters more in December than it does in October.

For a first-time trekker with limited equipment, winter above 4,000 metres is not the place to start. For an experienced walker willing to carry a proper bag, a February trek through the middle hills with the whole range visible and nobody else on the trail is one of the best things Nepal offers.

Start by identifying the maximum altitude you will sleep at, not the maximum altitude you will reach. Sleeping altitude drives cold, acclimatisation and teahouse availability, and it is the number that should shape your season.

Then identify the rainfall regime. Is your route south of the main range, and therefore in the monsoon's path, or behind it in the rain shadow? Annapurna Base Camp, Everest Base Camp, Langtang, Mardi Himal and Poon Hill are all south of the divide. Upper Mustang, Dolpo and Nar-Phu are not.

Now apply the seasons. High and south of the divide: October to November first, April to May second, and avoid the monsoon. Low and south of the divide: October to November and March to April are ideal, and December to February is excellent if you can take the cold. Behind the divide: summer works, and the depths of winter are hard because of cold and access.

Check the festival calendar for your specific year. Dashain and Tihar move annually with the Bikram Sambat calendar, so the dates that applied to a friend's trip do not apply to yours. If your trek depends on domestic flights or long bus journeys, book them before these weeks rather than during.

Build buffer days around any mountain flight, particularly Lukla. Cloud and wind cancel flights in every season, and a trek planned with no slack between the last trekking day and an international departure is a plan that fails on a normal weather day rather than an unusual one.

Finally, decide honestly how much you care about the view. If the mountains are the point, take the clear months and accept the crowds. If walking is the point, the shoulder weeks and the quiet season give you a much better trek for less money on emptier trails.

Whatever you choose, check conditions close to departure. Nepal Tourism Board publishes travel updates, the meteorology department publishes forecasts and monsoon announcements, and local knowledge at the trailhead is better than any of them.