Half Dome, Yosemite

view of half dome

Despite being described by California Geological Survey as “perfectly inaccessible”, George Anderson reached the summit in 1875, charting a route and placing iron eye bolts in the granite for the thousands who would proudly follow.

Why take the Half Dome trail? Or maybe, why not? It’s got 900 feet (300 meters) of spectacular waterfalls to enjoy on the Mist Trail route; 4,800 feet (1,460 meters) of elevation gain; a nerve-rattling cable climb that tests your strength and courage; and unforgettable panoramic views at the top.

a couple standing at the tunnel view

Yosemite and Giant Sequoias One Day Tour from San Francisco

  • 15 Hours
  • 209+

The only 1-day Yosemite tour from San Francisco to deliver more than you dreamed at Half Dome, El Capitan, Yosemite Falls and on a hike to Giant Sequoias.

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girl with her hands in the air looking at valley from Tunnel View overlook in Yosemite

Yosemite Overnight Tour from San Francisco with No Accommodation

  • 269+

This Yosemite tour from San Francisco let’s you make your own overnight stay so you can slow the pace to experience Half Dome, El Capitan, Yosemite Falls and the Giant Sequoia redwoods.

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Even for the most experienced climbers, the vertical ascent of Half Dome is physically and mentally demanding. The first ascent of Half Dome’s craggy northwest face was in 1957 by Royal Robbins, Mike Sherrick, and Jerry Gallwas. Their five-day, epic Grade VI climb has now been free climbed several times in a few hours’ time.

All summit attempts by hikers up the smooth, back shoulder of Half Dome end with a 425-foot (130 meters), 45-degree ascent using metal cables which allow climbers to effectively pull themselves up to the summit with the aid of climbing equipment. The National Park Service considers the Half Dome hike to be “Extremely Strenuous,” and advises hikers to take plenty of time to complete the ascent.

Hike Distance:

  • 14.2 miles (22.7 km) round trip via Mist Trail
  • 16.5 miles (26.5 km) round trip via John Muir Trail
  • 20.0 miles (32.0 km) round trip via Glacier Point
  • 23.0 miles (37.0 km) round trip via Tenaya Lake

What to bring on your hike:

  • Topographic map of the area and compass
  • Footwear. Wear boots that are well broken in and have good ankle support.
  • Gloves. Helpful to prevent chaffing of your hands on the cables.
  • Trash. There is no service on the trails. Be sure to pack out all trash.
  • Water. Carry plenty of water, at least 4 liters if you are hiking to the top of Half Dome.
  • Flashlight or headlamp with extra batteries.
  • Essentials. First aid kit, trail mix, whistle, sunscreen, and emergency blanket.

Restrooms. Toilets are only available at the Vernal Fall Footbridge, Emerald Pool, near the top of Nevada Fall, and in Little Yosemite Valley

Start early. It will likely take 10-12 hours to complete your Half Dome hike in Yosemite, so aim to start up the trail at sunrise (or earlier). Have the group establish a firm time at which you will turn around, regardless of where you are.

Warning. It is a bad idea to climb in rain, thunderstorms and colder months, as rain and ice make the granite slick. Lightning strikes are a risk while on or near the summit and have taken the lives of several hikers.

The Half Dome cables are generally installed and available for hikers between Memorial Day weekend and Columbus Day in October. Conditions on the trail can cause these dates to change. Permits are required to climb Half Dome. Read more information about the Half Dome hike and the procedure for acquiring a permit here.

Yosemite National Park has a very nicely organized program, called “Ask a Climber”, for those interested in hiking to the top of Half Dome. Climbing rangers offer live events covering the geology of Yosemite’s cliffs and domes, climbing history, nature and safety. Check it out here.


half dome vista from the glacier point overlook

How long is the Half Dome hike?

Most hikers begin the 16-mile (26 kilometer) trek at Happy Isles (shuttle stop #16). For the average hiker, it will take 10-12 hours to cover the 4,800 feet (1,460 meters) of elevation gain and reach the summit, so aim to start up the trail at sunrise (or earlier).

Is hiking Half Dome dangerous?

The National Park Service grades all Half Dome hikes as “Extremely Strenuous”. The most challenging portion of the trail is the cable-assisted climb to the summit where nine fatal accidents have been recorded since 1919. Most dangerous incidents occur when hikers become dehydrated or attempt the summit during lightning storms.

What caused Half Dome in Yosemite?

Half Dome was formed 60 million years ago when molten granite pushed up from the Earth’s core toward the surface, forming a magma chamber that crystallized as it cooled. Millions more years of uplifting forces, glacial activity and erosion have made Half Dome into what it is today.

Where is Half Dome?

Half Dome rises prominently over the valley floor of Yosemite National Park in Northern California. The formation can be seen from most viewpoints in Yosemite. Half Dome has been most famously painted and photographed from Tunnel View located just outside the Wawona Tunnel on Highway 41 (Wawona Road).

How hard is the Half Dome hike?

The National Park Service grades all Half Dome hikes as “Extremely Strenuous”. The most used trail from the Yosemite’s valley floor covers 4,400 feet (1,340 meters) of elevation gain before reaching the final 45-degree, cable-assisted climb to the summit. Most hikers require 10-12 hours to complete the round-trip.

How high is Half Dome?

Half Dome rises 4,737 feet (1,444 meters) above the valley floor to dominate Yosemite National Park. Yosemite itself is in the Sierra Nevada mountains of California, putting Half Dome’s peak at 8,846 feet (2,696 meters) above sea level.

Do you need a permit to Hike Half Dome?

Permits are required for day hikers and backpackers. A “pre-season” lottery for 225 permits per day opens on March 1st. A daily lottery during hiking season makes a small number of additional permits and cancellations available two days before the hike. To apply for a permit, visit Recreation.gov.