Spring and autumn are generally considered to be the best seasons to visit Nepal, since the weather tends to be moderate and stable, with clear skies. However, due to the complex nature of Nepal’s geography and climate, there's a lot more to this.

Like any other adventure trips or cultural holiday, the best time for leisure tours in Nepal is obviously during the spring season and autumn or fall season. During these seasons, the weather is pleasant with efficient sunlight and warmth. The sky is clear and allows travelers to truly enjoy the remarkable Nepalese landscape completely along with the panoramic Himalayan backdrops. 

Trekking can also be done in winter (December to February) as well especially in the hilly regions, but as you reach higher elevations, it is much colder along with snowfall.

Just like hiking or trekking trips, other adventure trips in Nepal such as white-water rafting, canyoning or bungee jumping can be done throughout the year although monsoon season may not be a good choice.