ElevationAscent: 4,457' 1,358 m
Descent: -4,457' -1,358 m
High: 8,476' 2,583 m
Low: 4,083' 1,245 m
GradeAvg Grade: 12% (7°)
Max Grade: 54% (28°)
Current trail conditions
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“THE premier route in Yosemite. Run to the top of the most iconic granite dome in the USA.”— Brian Smith
Many people find gloves helpful on the cables. However, if you bring your gloves up, pack them out. Hundreds of pounds of rotting gloves otherwise accumulate.
The only treated water on the trail is available (summer only) at a drinking fountain at the Vernal Fall Footbridge (less than a mile from the trailhead). Merced River water is available up to Little Yosemite Valley, however you should treat this water by boiling, using iodine, or using a giardia-rated water filter. Drinking untreated river water may cause significant illness.
Most people take 10 to 12 hours to hike to Half Dome and back; some take longer. If you plan on running during the day, it's smart to leave around sunrise (or earlier) and then have a non-negotiable turn-around time. For instance, if you haven't reached the top of Half Dome by 3:30 pm, you'll turn around. Check for sunrise and sunset times before you run. Regardless, each person should carry a flashlight or headlamp with good batteries (runners commonly struggle down the trail after dark because they don't have a flashlight). Although the trail is well marked, you should be prepared with a good topographic map and compass and know how to use them.
Most people begin the run from Happy Isles (shuttle stop #16), which is about a half-mile from the trailhead parking lot or about 3/4 of a mile from Curry Village (parking available). Shuttle service doesn't begin until 7 am, so if you're arriving prior to then, you can walk on the road (closed to all but authorized vehicles) from either parking area to the trailhead.
Start the journey on the John Muir Trail: Happy Isles to Half Dome Trail. You can either stay on the JMT all the way to Half Dome Trail for a longer but mellower run or turn left onto Mist Trail after one mile. This route follows Mist Trail for an up close and personal view of Vernal and Nevada Falls. Eventually, you'll merge back onto the JMT. After just over 5 miles, look for the Half Dome Trail to branch off to the left.
The trail steadily climbs to the north-northwest through the forest for roughly a mile before turning west and then southwest toward Half Dome. You'll eventually emerge from the tree-cover onto solid granite and begin ascending a steep series of switchbacks to a saddle below the cables.
The most famous--or infamous--part of this trail is the ascent up the cables. The two metal cables allow hikers to climb the last 400 feet to the summit without rock climbing equipment. Since 1919, relatively few people have fallen and died on the cables. However, injuries are not uncommon for those acting irresponsibly.
The Half Dome cables usually go back up the Friday before Memorial Day (conditions permitting) and come down the day after Columbus Day.
Tips while using the cables:
- Take your time and be patient with slower hikers
- Allow faster hikers to pass you (when possible)
- Remain on the inside of the cables
- Storm clouds are in the area
- The ground is wet (the cables and rock become very slick when wet; most accidents on the cables occur during wet conditions)
- The cables are down for the winter (typically, from the day after Columbus Day until Memorial Day weekend) (Check conditions update for status and any available updates)
Squirrels, Steller's jays, chipmunks, and other animals also live along the trail; never feed them or allow them to get your food. Do not leave your pack unattended (e.g., at the base of the cables or while you take a swim or nap). Keep wildlife wild: respect them from a distance.
Improper food storage and feeding of wildlife may result in a fine (up to $5,000).
Land Manager: NPS - Yosemite