Autumn is the very best season for Everest Base Camp Trek. It is equally best even in the spring season. The EBC Trekking Route is very crowded during these both times.
If there is anyone, who prefers the less disturbance time for enjoying much, then it would be better to trek to Everest Base Camp in winter, though, it is cold.
Besides, Everest Base Camp Trek in summer and monsoon season is also perfect for the rain lovers. The trekkers may experience the distinctive enjoyment with wet.
If you are having the Everest Base Camp Treks in May, you can have the chance to see the Everest Marathon. It is held on 29th May every year.
Overall, spring and autumn can be considered as the Everest Base Camp Trek best time of year.