The months of February to April and September to November make for the best time to visit Nepal. During this time of the year, the weather remains at its best and the country gets swayed in a celebratory frenzy with the onset of various events and festivals. Nice weather and unending frolics bring in skyrocketing prices and huge crowd during this time of the year. It makes sense to book air tickets aboard international flights to the destination well in advance. The best time for trekking adventures remains the months between October and May, when the weather is relatively stable.