Half Dome is the defining symbol of Yosemite National Park. Rising to an elevation of about 8,842 feet and standing nearly 4,800 feet above its base, this enormous granite formation dominates the eastern end of Yosemite Valley and appears in some of the most recognizable landscapes in the American national park system.
For many visitors, Half Dome is something to admire from Yosemite Valley, Glacier Point, or the high country. For hikers, however, it represents one of Yosemite’s great physical challenges. The classic hike from Happy Isles travels past Vernal Fall and Nevada Fall, passes through Little Yosemite Valley, climbs the steep Sub Dome, and finishes with a 400-foot ascent using Yosemite’s famous metal cables.
Reaching the summit is an extraordinary accomplishment, but Half Dome should never be treated as an ordinary day hike. Depending on the route, hikers travel roughly 14 to 16 miles round trip and gain close to 5,000 feet of elevation. Permits are required for the Sub Dome and cable section while the cables are installed, and weather can transform the final climb from challenging to dangerous very quickly.
Fortunately, hiking to the summit is only one way to experience Half Dome. Some of Yosemite’s finest viewpoints provide spectacular perspectives of the formation without requiring a permit or an all-day hike.
β‘ Half Dome Fast Facts
| Detail | Information |
|---|---|
| Location | Yosemite National Park, California |
| Summit elevation | About 8,842 feet |
| Height above base | About 4,733 feet |
| Typical day-hike distance | Roughly 14β16 miles round trip |
| Elevation gain | About 4,800β5,000 feet |
| Typical hiking time | About 10β12 hours |
| Difficulty | Very strenuous |
| Final cable section | About 400 vertical feet |
| Permit required | Yes, when the cables are up |
| Cable season | Usually late May through early to mid-October |
| Main trailhead | Happy Isles |
| Best for | Experienced and well-prepared hikers |
Mileage varies depending on whether hikers use the Mist Trail, John Muir Trail, or a combination of the two.
ποΈ What Is Half Dome?
Half Dome is a massive granite formation overlooking the eastern end of Yosemite Valley. Its distinctive shape combines a broad, rounded summit on one side with an enormous near-vertical face on the other.
From some angles, the mountain appears to have been cut cleanly in half. This appearance gave Half Dome its familiar English name, but the formation was not created when one complete half of a symmetrical dome suddenly broke away.
In fact, more than half of the original dome remains.
Its modern shape developed gradually through a combination of geological processes. Fractures in the granite helped create the steep northwest face, glaciers eroded the surrounding landscape, exfoliation rounded portions of the summit, and repeated rockfalls continued to reshape the exposed cliffs.
Those processes are still occurring today.
πͺ¨ How Was Half Dome Formed?
The story of Half Dome begins deep below the Earth’s surface.
Much of Yosemite is composed of granitic rock that formed when magma slowly cooled and crystallized underground tens of millions of years ago. Over immense periods of uplift and erosion, the rock above these granite bodies was stripped away, eventually exposing the solid granite landscape of the Sierra Nevada.
Rivers first carved deep valleys into the rising mountains. Later, glaciers repeatedly moved through the region, widening and deepening those valleys.
Half Dome stood directly beside these enormous rivers of ice.
Glaciers scoured both sides of the formation and helped steepen its slopes. A major vertical fracture in the granite created a natural weakness along what became Half Dome’s sheer northwest face.
The summit was shaped differently. Because the top was not completely overridden by the glaciers, curved fractures known as exfoliation joints allowed layers of granite to peel away gradually, helping produce the rounded profile visible today.
π What Happened to the Other Half of Half Dome?
Despite the name, Half Dome probably never looked like a perfectly rounded dome that was suddenly chopped into two identical pieces.
Geologists believe the distinctive profile developed gradually.
The near-vertical face follows a major joint, or fracture, in the granite. Glacial erosion helped expose and steepen this surface, while rockfalls removed additional material over time.
Meanwhile, exfoliation shaped the rounded upper portion.
The result is a mountain that looks dramatically asymmetrical from Yosemite Valley but is much more complex than its name suggests.
Half Dome continues changing today as weathering, water, temperature changes, and occasional rockfalls reshape its granite surfaces.
π Where Can You See Half Dome?
Half Dome is visible from numerous locations around Yosemite National Park, and each viewpoint provides a different perspective.
From Yosemite Valley, the formation appears high above the eastern end of the landscape. From Glacier Point, visitors look nearly across at Half Dome and can appreciate the enormous drop toward the valley below.
Olmsted Point along Tioga Road reveals the opposite side of Half Dome from the perspective most visitors see in Yosemite Valley.
Other excellent viewpoints include:
- Glacier Point
- Washburn Point
- Tunnel View
- Sentinel Bridge
- Cook’s Meadow
- Mirror Lake
- Olmsted Point
- North Dome
- Clouds Rest
- Sentinel Dome
You do not need to climb Half Dome to appreciate it. In fact, some of the best photographs of the mountain are taken miles away.
π Half Dome From Glacier Point
One of the finest views is from Yosemite National Park’s Glacier Point.
From this elevated viewpoint, Half Dome rises almost directly across the landscape, while Vernal Fall, Nevada Fall, Liberty Cap, and portions of Yosemite’s high country appear nearby.
This perspective is particularly useful for understanding the route hikers take toward Half Dome. You can see how the Merced River climbs into the mountains and how the summit stands well above Yosemite Valley.
Glacier Point is also one of the best options for visitors who want an impressive Half Dome experience without undertaking a strenuous hike.
π Half Dome From Yosemite Valley
The view from the valley floor is dramatically different.
From locations such as Sentinel Bridge and Cook’s Meadow, Half Dome rises above forests and the Merced River. Morning and evening light can transform the granite from gray to gold, orange, pink, or purple.
One of the most photographed compositions places Half Dome above the Merced River, where calm water may reflect portions of the surrounding landscape.
Because the formation sits toward the eastern end of the valley, its appearance changes substantially as you move from one viewing location to another.
π₯Ύ Hiking Half Dome
The standard Half Dome day hike begins at Happy Isles in Yosemite Valley.
From there, hikers climb toward Vernal Fall and Nevada Fall before continuing into Little Yosemite Valley. The route then ascends through forest toward Half Dome, eventually reaching the base of Sub Dome.
The final portion becomes dramatically steeper.
Hikers climb stone steps and exposed granite across Sub Dome before arriving at the base of the famous cable route. Two steel cables run up the final approximately 400 vertical feet of steep granite to the summit.
The entire trip is long, physically demanding, and potentially dangerous during poor weather.
For most hikers, reaching the summit and returning to Yosemite Valley takes roughly 10 to 12 hours.
π How Long Is the Half Dome Hike?
The precise distance depends on the route.
Using the shortest combinations of the Mist Trail and connecting trails produces a hike of roughly 14 miles round trip. Following more of the John Muir Trail increases the distance, with the National Park Service listing a route of about 16.2 miles round trip.
Elevation gain is roughly 4,800 to 5,000 feet.
Those numbers make Half Dome one of the most demanding popular day hikes in the national park system.
The difficulty does not come only from the cables. By the time hikers reach them, they have already climbed thousands of vertical feet and traveled several miles through mountainous terrain.
Saving enough energy for the return hike is essential.
π The Mist Trail
Many Half Dome hikers begin their journey on the famous Mist Trail.
The trail follows the Merced River toward Vernal Fall and then climbs steep granite steps beside the waterfall. During strong spring runoff, spray can soak hikers and make portions of the route wet and slippery.
Beyond Vernal Fall, the trail continues toward Nevada Fall.
This section of the Half Dome hike is spectacular enough to be a major Yosemite destination on its own. Hikers pass two powerful waterfalls before even beginning the more remote portion of the journey toward Half Dome.
Seasonal trail work, winter closures, rockfall, ice, and other conditions can occasionally affect the Mist Trail, so check the current trail status before hiking.
π¦ Vernal Fall
Vernal Fall is approximately 317 feet high and is one of Yosemite’s classic waterfalls.
Half Dome hikers approaching via the Mist Trail climb alongside it before continuing toward Nevada Fall.
The climb is steep, and the stone steps may be wet from waterfall spray. Early in the day, this section can provide a good indication of whether you are physically prepared for the much longer journey ahead.
Visitors already exhausted by the time they reach Vernal Fall should seriously consider whether continuing all the way to Half Dome is a good idea.
Turning around is always a reasonable decision.
π Nevada Fall
Nevada Fall drops approximately 594 feet and marks another major landmark along the route.
By the time hikers reach the top, they have already completed a substantial amount of climbing.
Liberty Cap rises dramatically beside the waterfall, while the Merced River continues toward Little Yosemite Valley.
This area provides some of the most impressive scenery of the entire Half Dome hike.
It is also a good place to reassess your pace, energy, water supply, weather, and available daylight before continuing deeper into the wilderness.
π² Little Yosemite Valley
Above Nevada Fall, the landscape changes noticeably.
The trail enters the broader and more forested Little Yosemite Valley, following the Merced River through a quieter portion of Yosemite’s wilderness.
This area provides a welcome break from the steep climbing around Vernal and Nevada Falls.
Little Yosemite Valley is also home to a designated wilderness campground frequently used by backpackers making Half Dome part of an overnight trip.
Camping here requires a Yosemite Wilderness permit. A day-hiking Half Dome permit does not authorize overnight camping.
Even from Little Yosemite Valley, hikers still have substantial climbing ahead before reaching the summit.
πͺ¨ Sub Dome
As hikers approach Half Dome, the terrain becomes increasingly exposed.
The Sub Dome is the final major obstacle before the cables. A series of steep stone steps and granite slabs climbs toward the base of Half Dome’s rounded summit.
This portion is physically demanding and can feel especially difficult after hiking for several hours.
There are also exposed sections where a fall could have serious consequences.
When the Half Dome permit system is in effect, hikers must have a permit to continue onto the Sub Dome and cable route.
Reaching the base of the cables does not mean the hardest part is over.
π§ The Half Dome Cables
The Half Dome cables are the most famous part of the hike.
Two metal cables run up approximately 400 vertical feet of steep granite. When they are installed for the hiking season, metal posts lift the cables above the rock and wooden crossboards provide occasional places for hikers to rest their feet.
The cables allow hikers to reach the summit without technical rock-climbing equipment.
That does not make the ascent easy.
The granite is extremely steep, upper-body fatigue can become significant, and hikers may need to coordinate carefully with people traveling in the opposite direction.
Anyone uncomfortable with the exposure should feel free to turn around.
Reaching the base of the cables is already a significant hike.
ποΈ Do You Need a Permit for Half Dome?
Yes.
When the cables are installed, a Half Dome permit is required to ascend the Sub Dome and cable route.
Day-hiking permits are distributed through a lottery. Most become available through a preseason lottery held in March, while a smaller number are offered through a daily lottery during the hiking season.
The daily lottery normally occurs two days before the intended hiking date.
A permit is required seven days per week while the cables are up.
Yosemite currently limits access to roughly 300 permitted hikers per day beyond the base of Sub Dome, including both day hikers and backpackers.
π« How the Half Dome Lottery Works
For day hikers, the main opportunity to obtain a permit is the preseason lottery.
Applications are generally accepted throughout March, with results announced afterward. Applicants can request several possible dates and a group of up to six people.
If you do not receive a preseason permit, the daily lottery provides another opportunity during the cable season.
Demand varies by day and season, but Half Dome permits are highly competitive.
Visitors should never plan a Yosemite trip around the assumption that they will definitely receive a permit.
There are many excellent alternative hikes if the lottery does not work out.
π Half Dome Permits for Backpackers
Backpackers use a different system.
If Half Dome is part of an overnight wilderness trip, hikers generally request Half Dome access in connection with an eligible Yosemite Wilderness permit.
Certain trailheads, including Happy Isles and several high-country routes, may allow Half Dome access to be added to the wilderness itinerary.
A regular overnight Wilderness permit by itself does not automatically authorize every backpacker to climb Half Dome.
Check the current Yosemite wilderness and Half Dome permit rules when planning your itinerary.
π When Are the Half Dome Cables Up?
The cables are generally installed shortly before Memorial Day weekend and remain up until around the second Monday in October.
Exact dates depend on conditions.
Snow, ice, weather, trail conditions, or maintenance needs can delay installation or cause changes to the schedule.
The National Park Service strongly discourages hikers from attempting the cable route when the cables are down.
Check the official Half Dome status shortly before your hike rather than relying solely on typical seasonal dates.
𧀠What Gear Do You Need for Half Dome?
Half Dome requires more preparation than an ordinary Yosemite day hike.
Useful equipment includes:
- Hiking shoes or boots with excellent traction
- Several liters of water or a reliable treatment system
- High-energy food and snacks
- Headlamp with fresh batteries
- Gloves for the cable section
- Sun protection
- Layered clothing
- Rain shell
- Map or downloaded navigation information
- Basic first-aid supplies
- Half Dome permit
- Government-issued identification for the permit holder
- Emergency supplies appropriate for a long mountain hike
A headlamp should be considered essential even if you expect to return before dark.
Unexpected delays, fatigue, weather, or congestion can easily extend the day.
𧀠What Kind of Gloves Should You Use?
Many hikers wear gloves for the cable section because the metal can be uncomfortable and difficult to grip for extended periods.
Choose gloves that provide dependable grip while allowing reasonable hand movement.
Work gloves with good palms are a common choice.
Do not leave your gloves at the base of the cables after finishing the hike. Abandoned gloves become litter and must eventually be removed from the wilderness.
Pack out everything you bring.
π§ How Much Water Do You Need?
Half Dome is a long hike, and dehydration is a serious concern.
How much water each person needs varies with temperature, body size, hiking pace, fitness, and personal requirements. Hot summer days can dramatically increase water consumption.
Do not underestimate the amount needed simply because the hike begins near rivers and waterfalls.
Water from natural sources should be properly treated before drinking.
Electrolytes and salty foods can also be useful during long, hot hikes, particularly for people drinking large quantities of water.
β° What Time Should You Start?
Most Half Dome hikers should start very early.
Leaving around or before sunrise provides more daylight for the long journey and improves the chances of reaching the summit before the afternoon thunderstorm period.
Many hikers start in darkness.
Carry a headlamp and know your route before beginning.
Set a firm turnaround time as well. If progress is much slower than expected, continuing toward the summit can lead to a long and potentially dangerous return after dark.
The summit is optional. Getting safely back to Yosemite Valley is not.
βοΈ Thunderstorms and Half Dome
Weather is one of the greatest dangers on Half Dome.
Thunderstorms occur most frequently during the summer months and often develop during the afternoon, although storms can happen at any time.
Half Dome’s exposed summit is an extremely dangerous location during lightning.
If storm clouds begin developing, do not continue toward the summit.
Hikers already near the summit should descend carefully while conditions remain safe.
Trying to squeeze in a summit before an approaching storm is an unnecessary gamble.
π§οΈ Never Climb Wet Cables
Wet conditions make the Half Dome cable route dramatically more dangerous.
The granite becomes extremely slick when wet, and the metal cables themselves can also become difficult to grip.
The National Park Service specifically warns hikers not to attempt the ascent when the rock is wet or storm clouds are nearby.
Many serious incidents on the cable route have occurred during wet or icy conditions.
If rain begins or the rock is wet, turning around is the appropriate choice.
No summit is worth risking a fatal fall.
π₯Ά Summit Weather
Conditions on Half Dome can be dramatically different from Yosemite Valley.
The summit is roughly 15 to 20 degrees Fahrenheit cooler than the valley under typical conditions, and wind can make it feel colder still.
A warm morning near Happy Isles therefore does not guarantee comfortable conditions at 8,842 feet.
Carry an insulating layer and rain protection even if the valley forecast appears mild.
Mountain weather can change quickly.
π§ Altitude and Fatigue
Half Dome’s summit elevation is high enough for some visitors to experience altitude-related symptoms.
Headache, nausea, unusual fatigue, dizziness, and weakness should not be ignored.
The combination of altitude, dehydration, heat, inadequate nutrition, and physical exhaustion can make it difficult to determine exactly what is happening.
If symptoms become serious, descending is generally the safest response.
Fatigue itself is also a major consideration. Remember that reaching the summit represents only half the journey.
You still have thousands of feet of descending and several miles of hiking before returning to Yosemite Valley.
π What Is the Summit Like?
The broad summit of Half Dome provides extraordinary views across Yosemite.
From the top, hikers can look into Yosemite Valley, across Tenaya Canyon, toward Clouds Rest, and across large portions of the Sierra Nevada.
The perspective is completely different from what you see below.
The summit itself is larger and flatter than many visitors expect from viewing Half Dome at a distance.
Do not let that create a false sense of security.
Enormous cliffs surround portions of the summit, and there are no railings along many exposed edges. Stay well back from drop-offs.
π§ Who First Climbed Half Dome?
Half Dome was once considered essentially unclimbable.
That changed in 1875, when George Anderson reached the summit using an early system of drilled holes, iron eyebolts, and rope.
His ascent proved that Half Dome could be climbed and helped establish the route that eventually evolved into today’s cable system.
Permanent cables were installed in the early twentieth century, opening the summit to hikers without technical climbing skills.
Half Dome has since become one of Yosemite’s best-known hiking destinations.
π§ Rock Climbing on Half Dome
The cable route is not the only way climbers reach Half Dome.
Technical climbing routes cross several portions of the formation, including its enormous northwest face.
One of the best-known routes is Snake Dike, which climbs prominent natural features along the southwest side before reaching easier terrain near the summit.
Technical climbing on Half Dome is very different from hiking the cables and requires appropriate rock-climbing experience, equipment, route-finding ability, and risk management.
Visitors without those skills should use established hiking routes.
π² Half Dome Without the Cables
Many visitors would rather admire Half Dome than climb it.
Fortunately, Yosemite offers outstanding alternatives.
Glacier Point provides one of the closest easily accessible panoramic views. Sentinel Dome combines a relatively short hike with sweeping views of Half Dome and Yosemite’s high country.
Olmsted Point provides an unusual view of Half Dome from the northeast along Tioga Road.
North Dome offers a remarkable perspective directly across Yosemite Valley, while Clouds Rest provides an even higher viewpoint and a demanding hike without requiring the Half Dome cables.
These alternatives are particularly useful for hikers who do not receive a permit or prefer to avoid the cable section.
ποΈ Half Dome vs. Clouds Rest
Clouds Rest and Half Dome are two of Yosemite’s most spectacular hiking objectives.
Half Dome is more famous and offers the unique experience of climbing the cables.
Clouds Rest reaches approximately 9,926 feet, making it higher than Half Dome, and provides sweeping views across Yosemite’s high country and down toward Half Dome itself.
Some hikers actually prefer the panorama from Clouds Rest.
The best choice depends on your goals. Half Dome offers history, challenge, and the famous cable route, while Clouds Rest offers a high summit experience without the same permit system or cable climb.
Both are strenuous mountain hikes.
ποΈ Half Dome vs. El Capitan
Half Dome and El Capitan are Yosemite’s two most recognizable granite landmarks.
El Capitan is famous for its enormous vertical face and its importance to the history of big-wall rock climbing.
Half Dome is particularly famous among hikers because its summit can be reached using established trails and the cable route.
El Capitan rises above the western portion of Yosemite Valley, while Half Dome dominates the eastern skyline.
Seeing both from multiple viewpoints helps demonstrate how varied Yosemite’s granite landscape really is.
π¨βπ©βπ§ Is Half Dome Suitable for Children?
There is no universal minimum age that determines whether someone is physically or emotionally prepared for Half Dome.
The hike demands stamina, good judgment, comfort with exposure, and the ability to safely manage the cable section.
A child who is an experienced mountain hiker may be better prepared than an adult with little hiking experience, but parents should take the exposure and consequences of a fall extremely seriously.
Families uncertain about the cables have many excellent alternatives, including Vernal Fall, Glacier Point, Sentinel Dome, and portions of the trail toward Nevada Fall.
There is no requirement to reach Half Dome’s summit to have an extraordinary Yosemite experience.
π Are Dogs Allowed on the Half Dome Trail?
Pets are not permitted on the Half Dome hiking route.
Yosemite restricts pets on most hiking trails and wilderness routes.
Visitors traveling with dogs should review current pet regulations and plan alternative activities in areas where leashed pets are permitted.
Never leave a pet unattended in a vehicle, particularly during warm weather.
π Best Time to Hike Half Dome
For most hikers, the practical Half Dome season corresponds with the period when the cables are installed, generally from late May through early or mid-October.
Early season conditions can include snow, high water, cold temperatures, and wet trails.
Summer usually provides the longest daylight hours but also brings heat, heavy visitation, and thunderstorms.
Early fall can offer cooler temperatures and generally stable conditions, although daylight becomes shorter and early storms can bring cold weather or snow.
There is no guaranteed perfect time.
The best Half Dome day is one with dry granite, a favorable weather forecast, sufficient daylight, and a properly prepared hiking party.
ποΈ Can You Make Half Dome an Overnight Trip?
Yes, but backpacking requires a Wilderness permit.
Many hikers spend a night at Little Yosemite Valley and climb Half Dome as part of a longer wilderness itinerary.
This breaks up the distance and allows hikers to experience a quieter portion of Yosemite after day visitors have returned to the valley.
However, carrying overnight gear adds weight and introduces additional planning requirements, including food storage, camping regulations, and wilderness permits.
A day-hiking Half Dome permit alone does not authorize camping.
πΊοΈ How Difficult Is Half Dome?
Half Dome should be considered very strenuous.
The combination of 14 to 16 miles of hiking, nearly 5,000 feet of elevation gain, steep waterfall trails, high elevation, exposed granite, the Sub Dome climb, and the cable section makes it a serious mountain outing.
Physical fitness is only part of the challenge.
Good decision-making matters just as much. Hikers need to monitor weather, pace themselves, carry adequate water and food, manage daylight, and be willing to turn around.
Completing Half Dome safely is far more important than reaching the summit at all costs.
π Is Half Dome Worth Hiking?
For experienced hikers who are properly prepared, receive a permit, and encounter safe conditions, Half Dome can be one of Yosemite’s most memorable adventures.
The journey passes Vernal Fall, Nevada Fall, Liberty Cap, Little Yosemite Valley, and some of Yosemite’s finest granite scenery before reaching one of the most recognizable summits in North America.
Yet the experience should not be reduced to reaching the top.
Every section of the route is part of the adventure.
And for visitors who decide the cable climb is not right for them, Yosemite offers countless places to admire Half Dome without ever setting foot on its summit.
π² Final Thoughts
Half Dome is more than a famous Yosemite hike.
It is one of the defining geological formations of the Sierra Nevada, shaped over millions of years by underground magma, uplift, erosion, glaciers, exfoliation, fractures, and rockfall.
For hikers, it is also a demanding journey requiring endurance and judgment. The roughly 14- to 16-mile route climbs nearly 5,000 feet before reaching the famous cables, where steep granite and exposure make conditions especially serious.
Prepare carefully, secure the required permit, start early, watch the weather, and never climb the cables when the granite is wet.
Most importantly, be willing to turn around.
Half Dome has stood over Yosemite Valley for an unimaginably long time. If conditions are not right today, the mountain will still be there for another attempt.
π Related Articles
- Yosemite National Park
- Tuolumne Meadows in Yosemite National Park: Best Hikes, Scenic Views & Visitor Guide
- Top 10 National Parks for Mountain Climbing
- The Top 10 National Parks in the World
π Sources & Further Reading
- National Park Service β Half Dome Day Hike β Official hiking, cable, weather, and safety guidance.
- National Park Service β Half Dome Permits for Day Hikers β Current permit requirements, lottery system, quotas, and cable season.
- Recreation.gov β Half Dome Permits β Current lottery procedures, permit conditions, hiking distance, elevation gain, and preparation guidance.
- National Park Service β Yosemite Valley Trails β Half Dome route distance, elevation gain, and information about the John Muir Trail approach.
- National Park Service β Natural Resource Statistics β Half Dome elevation and height above its base.
- National Park Service β Geology Hut Exhibits β Half Dome’s formation through exfoliation, glacial erosion, fractures, and rockfall.
- National Park Service β Formation of Half Dome β Geological explanation of Half Dome’s granite, glacial history, and distinctive face.
- National Park Service β Half Dome Safety Issues β Cable crowding, wet-rock hazards, storms, and Half Dome safety history.
- National Park Service β Lightning Safety β Thunderstorm and lightning guidance for Half Dome and Yosemite’s high country.
