Nepal's climate is hugely diverse due to its topography. Autumn (September-November) with its clear skies and stable weather, is the prime season for trekking. The spring (March-May) is a great time for viewing wildflowers and rhododendron blooms. Monsoon (June-August) makes trails slippery and views unclear, though fewer crowds offer solitude.
In the winter (December-February), the high-altitude areas become extremely cold, and some passes may be blocked due to snowfall, but lower elevation treks are still possible. Always keep track of the weather conditions during your trek; the Mountain Weather Information Service provides forecasts for different trekking regions (
MWIS).
Regardless of the season, it's crucial to be prepared for sudden weather changes and potential hazards. The Himalayan Rescue Association (
HRA) is a good resource for safety tips and health advice for trekking in Nepal.