Night temperatures often drop to freezing or below even in summer. Afternoon thunderstorms are common. Raingear, good boots, and warm clothes are essential. Ice axe and crampons are usually needed in spring and early summer. Carry water to the summit as there is no dependable source of water after Trail Camp.
Giardiasis is a serious problem so boil or filter all drinking water.
Mt. Whitney and Lone Pine, California. Piped water and flush toilets. Piped water and flush toilets. Campgrounds at Whitney Portal are usually open approx. May 15 - Oct. 15.