Langtang Valley Trek in June

The trail itself holds up well. This is a valley walk on a well-built path rather than a high crossing, and mud and slick rock are the main complaints rather than anything serious. The steep forest section between Syabrubesi and Lama Hotel is where care is needed.

Leeches are heavy below about 2,800m through the forest, and absent above it. That is a meaningful advantage over the Annapurna monsoon treks, where the leech zone extends much closer to the high country. Two days of your Langtang trek are leech territory; the rest is not.

The upper valley is green and empty and completely closed in. Kyanjin Gompa in June cloud is a handful of stone buildings in white, and Tserko Ri is pointless on most days.

Close to deserted. Lower lodges stay open; several Kyanjin Gompa houses close for the monsoon as they do for midwinter, leaving a reduced choice. Confirming accommodation up the valley matters more in June than in any month except January.

This is the decisive June problem. The Kathmandu to Syabrubesi road climbs through steep, unstable terrain and monsoon landslides close or delay it regularly, sometimes for a day or more. There is no flight alternative. Anyone booking a June trek should build in two spare days and treat the drive as the most likely thing to go wrong on the entire itinerary.