The best trekking zone Nepal offers adventures every time in the year depending upon which region you are choosing to trek. The most popular seasons for trekking in Nepal are autumn (September, October, November & December) and spring (February, March, April & May). Winter season is very cold in high mountains and mountain passes are totally covered with snow. But one can trek low altitudes. Many trekkers assume that rainy season (June-August) is not the proper time for trekking activities due to the heavy rain but, there are still plenty of activities and opportunity for adventure lovers. Even many first time trekkers are also satisfied with their monsoon trekking experience. The rain shadow area like Upper and lower mustang, Dolpo are the best places for a monsoon trek.