The granite of Half Dome was formed by the cooling of magma underground approximately 80 to 110 million years ago.
The cable system consists of two steel cables supported by vertical wooden poles, installed annually since 1919.
The first recorded ascent was completed by George Anderson in 1875 using eye-bolts drilled into the rock.
The 'face' of Half Dome is considered one of the most famous big-wall climbing routes in the world.
In 1931, the Sierra Club installed the current cable system to allow non-technical climbers to reach the summit.
Half Dome is visible from the Glacier Point overlook, providing a high-perspective vantage point without the strenuous hike.
Half Dome is a granitic batholith rising nearly 5,000 feet above the floor of Yosemite Valley. The northwest face is a sheer vertical cliff, while the northeast side offers a more accessible route to the summit via a cable-assisted climb. It is the centerpiece of the Yosemite wilderness and a destination for technical rock climbers and long-distance hikers. The summit provides a panoramic view of the High Sierra, including the Merced River canyon. Access to the final ascent cable system is strictly regulated by a pre-season and daily lottery permit system. The total round-trip trek from the valley floor spans approximately 14 to 16 miles with over 4,800 feet of elevation gain. Geologically, the dome was shaped by glacial action and exfoliation of granite layers.
Glacier Point provides the most comprehensive unobstructed view of the dome's entire profile.
Secure your climbing permit months in advance via the official lottery system to ensure access to the cables.
Carry at least 4 liters of water, as there are no reliable water sources after leaving the Little Yosemite Valley area.
Wear gloves with high friction grip, as the cables become slick from thousands of hands during the season.
Check the weather forecast for lightning risks, as the summit is entirely exposed and extremely dangerous during storms.
Attempting the summit hike if you have a fear of heights or without prior strenuous hiking experience; never attempt the cables during rain or lightning.
The cable system is only available for use during the summer and early autumn season; closed during winter due to snow and ice.
Practice Leave No Trace principles; pack out all trash, human waste, and food scraps to protect the fragile alpine environment.
