The most popular route to the summit is by way of the Mount Whitney Trail which starts at Whitney Portal (8,360 feet) 13 miles west of the town of Lone Pine. The hike is about 22 miles round trip with an elevation gain of over 6,100 feet. Permits are required year round, and to prevent overuse a limited number of permits are issued by the Forest Service between May 1 and November 1. Most hikers do the trip in two days. Those in good physical condition sometimes attempt to reach the summit and return to Whitney Portal in one day, thus requiring only a somewhat easier-to-obtain "day use" permit rather than the overnight permit. This is considered an "extreme" day hike, which normally involves leaving Whitney Portal before sunrise and 12 to 18 hours of strenuous hiking, while struggling with altitude sickness, cold air, and occasionally treacherous surface conditions (because snow and/or ice are normally present on parts of the trail, except for a short period from early July to late September.
The trail does not head up the direct route to the summit by the North Fork of Lone Pine Creek, as this is a very steep route used by mountaineers. Instead, it follows the gentler main branch of Lone Pine Creek to its source, and then climbs by 99 switchbacks to the Sierra crest about 2-1/2 miles south of the summit. The trail then travels very close to the crest of the range until reaching the summit plateau. This longer "dogleg" route makes possible a standard hiking trail. During peak season the trail is well-maintained and easy to follow. Once the mountain clears of snow and ice, usually in early to mid summer, it requires no mountaineering or winter gear. Beyond Trail Crest the trail loses a small amount of elevation that is gained on the return. In this final stretch of the trail, on the west side of Whitney's needle-like south ridge, some sections of the trail must be rebuilt after each winter. The views here of the interior High Sierra can be extraordinary, due in part to the precipitous exposure. The crowning views are had on the summit of Whitney, where the trail ends at the Smithsonian Institution Shelter. A single day hike of the trail usually starts between 2 and 4 AM. Most day hikers will complete the trip in between 10 and 20 hours. Because of the length, distance and high altitude of the trail, hiking it in a single day requires some fitness and endurance.
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