Location and surroundings
Half Dome is in the United States, in California, within Mariposa County. It sits in the chain North American Cordillera > Pacific Coast Ranges > Sierra Nevada > Yosemite-Ritter Sierra Nevada > Central Yosemite Sierra > Yosemite Valley. In the Yosemite Valley peak list it is the 5th highest of 50 named peaks, while the highest peak in the valley is Tenaya Peak, 12 km to the northeast.
The setting is a steep granite landscape of domes, cliffs, canyons and forested valley walls. Half Dome rises at the eastern end of Yosemite Valley, above a terrain shaped by rock joints, erosion and glacial carving. Nearby high points include domes and ridges close to the valley floor, so the mountain is seen in a compact but very rugged alpine environment.
Neighbouring peaks
- Ahwiyah Point — 2,103 m, 0.6 km NW
- Mount Broderick — 2,041 m, 1.4 km S
- Liberty Cap — 2,151 m, 1.9 km S
- Grizzly Peak — 1,846 m, 2.3 km SW
- Basket Dome — 2,315 m, 2.5 km NW
- North Dome — 2,299 m, 2.6 km NW
- Quarter Domes — 2,535 m, 2.8 km NE
- Panorama Point — 2,132 m, 3.7 km SW
These neighbours show how isolated Half Dome is above the valley. Several nearby domes and points are lower, while Quarter Domes is the closest of the listed higher neighbours. The mountain’s prominence of 414 m gives it a clear rise above the surrounding terrain without making it a standalone giant in the wider Sierra Nevada.
The view from the summit
From the summit, the main distant high peaks within 25 km are all to the east in the Sierra Nevada backcountry. The tallest are Mount Lyell at 3,993 m, 23.0 km east, and Rodgers Peak at 3,956 m, 24.4 km east. Other major peaks in view include Mount Florence 19.1 km east, Parsons Peak 20.1 km east, Simmons Peak 21.1 km east, and Electra Peak 24.4 km east.
These peaks sit well beyond the immediate valley walls, so the summit outlook combines close granite domes with a longer view toward the higher crest of the Sierra Nevada. The eastward skyline is the most important one for larger mountain scenery.
The range
Half Dome belongs to the Sierra Nevada, which is part of the Pacific Coast Ranges in the North American Cordillera. In the range hierarchy given here, it sits in the Yosemite Valley part of the Sierra Nevada. The range high point listed in the surrounding area is Tenaya Peak at 3,129 m, about 12 km northeast of Half Dome.
The Yosemite Valley peak list contains 50 named peaks, and Half Dome ranks 5th highest among them. That makes it one of the leading summits in the valley, even though it is far below the highest Sierra Nevada peaks farther east.
Climbing routes
The best-known ascent is the Half Dome Cable Route, which follows the valley approach and then the final steep section on fixed steel cables. The route is described as class 3 with the cables in place. The approach from Yosemite Valley is about 8.2 mi (13 km) via the Mist Trail, with roughly 4,800 ft (1,460 m) of gain. The same face away from the cables is rated class 5.
Technical climbers also use the Regular Northwest Face, first climbed in 1957 by Royal Robbins, Mike Sherrick and Jerry Gallwas. Other routes ascend the south face and west shoulder. The usual overnight base for longer trips is Little Yosemite Valley, where backpackers often camp before the summit day.
Access and starting points
The usual starting point is Yosemite Valley. From there, the standard approach follows the Mist Trail and then continues through Little Yosemite Valley before turning north to the base of Half Dome. The route is long enough that many hikers split it into two days by camping in the valley backpackers’ area.
The final approach to the summit uses the cable section on the east face. In practical terms, the mountain is accessed from the main Yosemite Valley trail network rather than from a road directly to the summit. That makes the valley the key staging point for both hikers and climbers.
Climate and weather
Climate estimates from NASA POWER for 2001–2020 suggest that the summit is warmest in July, at about 15 °C, and coldest in December, at about -4 °C. Mean temperatures above freezing at the summit usually occur from April to November. The surrounding area receives about 700 mm of precipitation a year, with the wettest month in December at about 125 mm and the driest in August at about 5 mm.
Weather hazards in this part of the Sierra Nevada include summer heat on the approach, afternoon thunderstorms, winter snow and ice, and wet rock after rain or snowmelt. The cable section becomes much more serious when the rock is slippery, and exposed granite can be hazardous in wind or lightning.
Best time to visit
For a summit attempt, the most practical period is usually the warmer part of the year, when the summit is above freezing and the cables are normally in use. Based on the climate figures, that means April through November, with the most comfortable conditions generally in late spring, summer and early autumn. The drier month is August, which often gives more stable hiking weather.
Even in the main season, the route is long and exposed, so early starts are sensible. Snow, ice and cold mornings can still affect the upper mountain outside midsummer, and the final cables are not a place for wet or windy conditions.
Nature and wildlife
Half Dome rises from a landscape of granite cliffs, domes, conifer forest and open alpine rock. Lower slopes in Yosemite support mixed forest, while higher and more exposed ground becomes sparse, with patches of hardy shrubs, lichens and weathered stone. The area is part of a protected national park, so the natural setting is shaped more by conservation than by development.
Wildlife in the Yosemite region can include deer, black bears, coyotes, birds of prey and smaller mountain species. On the trail, the main practical concern is not wildlife but heat, dehydration, steep terrain and changing weather. Food storage and general park rules matter because of bears in the valley and backcountry.
Guides and organised ascents
For a route like Half Dome, a certified guide is useful for visitors who are unsure about long mountain days, exposed scrambling or route-finding in variable weather. In the United States, the national guide association is the American Mountain Guides Association, an IFMGA/UIAGM member. The national alpine club or federation is the American Alpine Club. Established guiding companies in the country include RMI Expeditions in Ashford, Washington, and Exum Mountain Guides in Moose, Wyoming.
Guided trips in the United States usually include route planning, pacing, safety decisions and equipment advice. For Half Dome itself, permit rules apply to hikers on the cable route when the cables are up between May and October, with a daily limit and ranger checks. Backpackers with a wilderness permit can receive a Half Dome permit when they pick up their permit, and climbers who avoid the subdome area may descend the trail without a permit.
Safety and preparation
Half Dome demands fitness, sure footing and comfort with long exposed days. The approach is strenuous, the final cable section is steep, and the rock can become dangerous when wet. Good shoes, early starts, enough food and layered clothing are essential. Because the summit day is long, many hikers underestimate fatigue on the descent.
For emergencies in the United States, the mountain rescue number is 911. Dispatchers alert the local search and rescue team, usually run by the county sheriff or the national park. Carry a map, tell someone your plan and be ready for changing conditions on the upper mountain.
History and name
The name Half Dome comes from the mountain’s shape, which looks like a dome cut in two when seen from the valley. Geologically, it is a quartz monzonite body that cooled deep underground and was later exposed by erosion. The apparent missing half is partly a matter of viewpoint, since the rock mass is more complex than the valley view suggests.
The summit was first reached in 1875 by George Anderson, who used drilled iron bolts and eye bolts on the smooth east face. Earlier, the mountain had been described as inaccessible. Anderson later added ropes, and the route became the basis for later climbs and for the modern cable line.
Interesting facts
Half Dome is one of the most famous rock forms in Yosemite and is the 5th highest of 50 named peaks in Yosemite Valley. Its prominence is 414 m, and the nearest higher peak in the valley list is Quarter Domes at 2,535 m, 2.8 km to the northeast. The highest peak in the valley is Tenaya Peak, 12 km away.
The summit is not a broad alpine peak but a large rock dome with a flat top. The cable route, the historical bolt line and the technical northwest face have all made it a landmark in both hiking and climbing history.
FAQ
How high is Half Dome? Half Dome rises to 2,694 m above sea level.
Where is Half Dome? It is in Yosemite National Park, Mariposa County, California, in the United States.
What range is Half Dome part of? It belongs to the Sierra Nevada, within the Pacific Coast Ranges and the wider North American Cordillera.
What are the nearest peaks to Half Dome? The closest listed neighbour is Ahwiyah Point, 0.6 km northwest. Other nearby peaks include Mount Broderick, Liberty Cap, Basket Dome and North Dome.
How long does it take to hike Half Dome? The standard route from Yosemite Valley via the Mist Trail is about 8.2 mi (13 km) one way with 4,800 ft (1,460 m) of gain; many people do it as a very long day, while others camp in Little Yosemite Valley.
Is there water on the way to Half Dome? You should carry your own supply for the day, usually 1.5-3 litres depending on heat and pace. The route is long and exposed, and water availability changes with season and conditions, so plan to refill only where you have reliable sources and treat any natural water you use.
Is mobile phone coverage reliable on Half Dome? Coverage in the hills is patchy and depends on the operator. On an open summit a signal may be possible, but deep valleys and ridges often block it. 112 reaches emergency services over any available network, and maps should be downloaded before setting out.