
The longest usable season of any trek on this list, because the highest point is 3,210m and nothing here closes for winter. March and April for the rhododendron, October and November for the clear air, and December to February when the high routes have shut.
March, April, October and November are prime season. February, May, September and December are good with caveats. January is shoulder season. June, July and August are the tough months. Every month below opens a full report: temperatures at real waypoints, trail and summit conditions, crowd levels, flights and what we advise.
Permits close. Weather windows narrow. The best Everest region teahouse beds fill by October, and spring season opens again in March. Our Kathmandu team is already booking for autumn. If you have been planning a trek, this is the window.