Nepal has four seasons. And the trekking can be done all around the year. Best Time to Trek in Nepal,However, preferably Autumn and Spring seasons are regarded as the best seasons for trekking. Autumn Season (September, October & November) is good for watching snow mountains and the Sunrise/Sunset. During the springtime, you can see a lot of flowers along the route. This is the flowering season and it’s an ideal time for the flower lovers. In Nepal, Spring season falls upon March, April & May. Winter (December, January & March) is good for Snow lovers. There would be often snowfall during the winter. And some of the route could be covered by snow. Summer & Monsoon season(June,July & August) is quite warm in the valleys. But in upper land still cooler. There would be several waterfalls on the hilly regions. There are less trekkers in the monsoon time.