California's most iconic outdoor adventure — a grueling 14-16 mile round trip climbing 4,800 feet to Yosemite's granite monolith via a notorious steel cable route with unforgettable summit views
The Half Dome hike in Yosemite National Park, California, is one of the most iconic and demanding day hikes in the United States. The round trip from Happy Isles Nature Center climbs 4,800 feet over 14 to 16 miles, ascending via the Mist Trail past the spray of Vernal Fall and the cascade of Nevada Fall before switchbacking up the Sub Dome's granite stairs to the base of the final cable route. The cables — two parallel steel lines fixed to bolts driven into the rock at roughly a 45-degree incline — ascend the final 400 feet of smooth, near-vertical granite to the summit plateau at 8,842 feet. On clear days, the panorama encompasses the full length of Yosemite Valley, the Clark Range, and Half Dome's shadow projected across the valley floor in the late afternoon.
The National Park Service issues a strictly limited number of wilderness day-use permits for the cable section — approximately 300 per day during the installation season, which typically runs from late May through mid-October. Permits are distributed through a pre-season lottery in March and a daily lottery opening two days before each date. Permit demand substantially exceeds supply between June and August; September is somewhat easier for securing a permit and arguably offers better hiking conditions as temperatures moderate and afternoon thunderstorm frequency decreases.
Physical preparation is critical. The 10 to 12-hour round trip demands strong cardiovascular fitness, prior experience on rocky and uneven terrain, and the ability to carry and consume at least 3 liters of water throughout the day. The final cable section involves a near-vertical ascent on smooth granite with significant exposure — slopes of 45 to 60 degrees and open drops on both sides of the cable route require composure under exposure as well as physical strength. Leather or reinforced hiking gloves are essential for grip on the steel cables, which strip skin from unprotected hands.
Cell phone coverage is absent above the Sub Dome. Lightning strikes on the exposed summit and cables have caused fatalities; any storm development visible to the west should prompt immediate descent. An early start from the Happy Isles trailhead — no later than 6:30 AM — is essential to reach the summit before afternoon storm risk develops, typically between 1 and 3 PM. Yosemite Search and Rescue maintains emergency response throughout the park.
Activity facts
- Where
- Yosemite Valley, CA
- Duration
- 10-12 hours
Equipment
Hiking boots, gloves for cables, trekking poles, 3+ liters water
Location
Happy Isles Nature Center, Yosemite Valley, CA 95389
37.7459, -119.5592 View on map
Highlights
- 14–16 mile round trip to the 8,842-foot summit of Yosemite's most iconic granite monolith with 4,800 feet of elevation gain
- Steel cable route on the final 400 feet of the dome's 45-degree near-vertical face, requiring grip strength and exposure tolerance
- Panoramic summit views over Yosemite Valley, Nevada Fall, and the Clark Range on clear days
- Permit-controlled access via NPS lottery limits the cable section to approximately 300 hikers per day
- Vernal Fall and Nevada Fall on the approach deliver spectacular scenery even without continuing to the summit
Tips for visiting
- Apply for the pre-season permit lottery in March at recreation.gov — the daily lottery (open 2 days in advance) is a harder-to-secure backup option.
- Leave Happy Isles trailhead no later than 6:30 AM; afternoon thunderstorms can develop rapidly and lightning on the exposed summit is a documented risk.
- Bring leather work gloves or via ferrata gloves for the cable section — unprotected hands on the steel cables suffer significant abrasion.
- Carry at least 3 liters of water from the trailhead; potable water is available at Little Yosemite Valley campground but nowhere above it.
- September is the best month for the hike: cables are still installed, crowds are reduced, and afternoon weather is more stable than July–August.
- Trekking poles ease the descent considerably; the Yosemite Valley gear shop near the Visitor Center offers rental poles.
Frequently asked questions
How do I get a permit to hike to Half Dome's cables?
The National Park Service distributes Half Dome permits through two lotteries: a pre-season lottery in March via recreation.gov covering the full season, and a daily lottery opening 2 days before each date. The pre-season lottery is significantly easier to win for peak summer dates. A small non-refundable fee applies per application.
How long does the Half Dome hike take?
Most fit hikers complete the round trip in 10–12 hours. Departing Happy Isles by 6:30 AM typically allows a summit arrival by early afternoon and a safe descent to the valley before dusk. Less experienced or slower hikers should budget 12–14 hours and plan an even earlier start.
Is the cable section of Half Dome dangerous?
The cable route involves ascending near-vertical granite with significant exposure on both sides and has been the site of multiple fatalities, most from lightning strikes during afternoon storms. Any sign of approaching weather — darkening skies or distant thunder — should prompt immediate descent from the cables or summit plateau.
What footwear and gear are essential?
Sturdy hiking boots or trail running shoes with good grip are essential; sandals and casual athletic shoes are inappropriate for the rocky, steep terrain. Leather or reinforced gloves are mandatory for the cable section. A headlamp is useful for the early morning start and any late-day descent.
Is the Half Dome hike suitable for children?
The hike to Nevada Fall (roughly half the total distance) is suitable for fit children aged 8 and above. The full route including the cable section requires adult physical capability, cable grip strength, and exposure tolerance. The NPS generally recommends the full route only for participants aged 12 and above with significant prior hiking experience.