Which Nepal trails close in the monsoon rains, and how to trek them safely

Why the roads close before the trails

Key facts

From the trail · Mustang

• The monsoon brings the great majority of Nepal's annual rain between mid-June and mid-September, with July and August the wettest.
• Landslides and flash floods — not altitude — are the main objective hazard of monsoon trekking.
• The first thing the rain closes is usually the road to the trailhead, not the trail itself.
• North of the main Himalaya, the rain-shadow regions stay dry and walkable all summer.

People tend to imagine monsoon danger as something that happens high on the mountain. In our experience it is the opposite. The rains rarely trouble you above the tree line, but they can wash out the road that gets you to the trail, turn a forest path into a mudslide overnight, and swell a stream you crossed dry in the morning into something you cannot cross by afternoon. Here is an honest map of where the risk sits in 2026 — and where it does not.

Where the rain bites hardest

The access roads are the weak link. The drives to Syabrubesi and Dhunche for Langtang, Besisahar for the Annapurna Circuit and Manaslu, and Beni for lower Mustang all run along river gorges that shed rock and mud in heavy rain, and a single slide can close them for hours or days. The lower, forested sections of trail are slippery and leech-ridden, and small slips are common. River and stream crossings are the other classic trap, rising fast and dangerously after a night of rain.

This season has been a textbook case of the roads going first. On 30 August the Trishuli washed out the Prithvi Highway at Krishnabhir in Dhading, the main road from Kathmandu to Pokhara, and it took 18 days and a new 270-metre track above the collapse before two-way traffic resumed on 17 September. The road to the Manaslu trailhead lost the Malekhu bridge, so the trekking association now routes vehicles via Galchhi, Dhading Besi and Arughat instead. On the Manaslu Circuit itself, a side-stream flood near Namrung on 6 September took two bridges, and the route reopened five days later. The trail was shut for five days; the roads, for weeks. The monsoon’s normal end date is 2 October, so it is not over yet; our conditions page has this week’s picture.

Where it is safe to walk

North of the high peaks, the Himalaya wrings the rain out of the clouds and the land beyond stays dry. Upper Mustang, Dolpo, Nar-Phu and the upper Manang valley lie in this rain shadow. They see only a fraction of the rain that falls on the rest of the country and trek beautifully right through July and August — which is exactly why they are our standard recommendation for a summer trip.

What this means for trekkers

Want the summer mountains without the mud? The rain-shadow north is the answer — see our Annapurna Circuit with Tilicho Lake or the fly-out Jomsom option, both of which reach into the drier high country. Check timing on our permits page and talk to us about the safest route for your dates.

Source: Department of Hydrology and Meteorology (monsoon norms); operator trail reports, June 2026.