Half Dome is the most coveted day hike in Yosemite National Park: a granite monolith rising 4,800 feet above Yosemite Valley, finished by a 400-foot ascent up steel cables bolted into the rock at a 45-degree angle. The round trip from Happy Isles runs 14 to 16 miles with roughly 4,800 feet of elevation gain, most hikers need 10 to 14 hours, and the final cable section requires a permit that is famously hard to win. This is not a hike to attempt casually — but with the right preparation, it is the experience of a lifetime.
The route: Mist Trail to the cables
The standard route starts at Happy Isles in Yosemite Valley and climbs the Mist Trail past Vernal Fall (317 feet) and Nevada Fall (594 feet) — both spectacular and both slippery, so stay on the trail and off wet rock. Beyond Nevada Fall the trail eases through Little Yosemite Valley before the final grind: the Subdome, a steep granite shoulder with switchbacks and a handrail, and then the cables themselves. The last 400 feet is a pull-up-the-cables ascent where you grip the steel cables with both hands and walk up wooden footholds; it is exposed, it is strenuous, and there is no shame in turning around if conditions feel wrong.
Permits: the lottery system
You need a permit to ascend the cables (the hike to the Subdome base requires none). Yosemite runs two lotteries on Recreation.gov: a pre-season lottery each March for the summer season, and a two-day-ahead daily lottery during the season — typically around 50 permits a day. Apply with flexible dates and a group if possible; weekday and shoulder-season dates are widely reported to have better odds. A ranger staffs a checkpoint at the base of the Subdome and turns back anyone without a permit, so there is no workaround — plan months ahead, and have a backup hike ready.
When to go: the cables season
The cables are generally up from late May through mid-October, depending on snow and conditions — they go up once the route is safely clear and come down before winter storms. July through September offers the most reliable weather and the driest cables; early season can still hold snow patches on the Subdome. Start very early, ideally before dawn: afternoon thunderstorms are the real danger on exposed granite, and you want to be off the cables and below the treeline well before clouds build. Never attempt the cables in rain, on wet rock, or when lightning is anywhere near.
Gear and preparation
Sturdy hiking boots with excellent grip are non-negotiable; gloves with good grip are widely recommended for the cables, where the worn steel gets slippery and cold. Carry far more water than you think you need — the only reliable drinking water on the route is the fountain at the Vernal Fall footbridge — plus a filter as backup, plenty of food, a headlamp (you will likely finish in the dark if you start late), sun protection, and layers. Train for it: 16 miles with 4,800 feet of gain is a serious day, and the altitude at the 8,800-foot summit makes everything harder than the mileage suggests.
Safety on the cables
The cables section has seen fatalities, almost all in wet conditions or lightning. Check the forecast the night before and the morning of, and be willing to abandon the summit — the mountain will be there next year. Keep three points of contact, let faster parties pass at the stanchions, and descend facing the rock. Some experienced hikers clip a personal tether to the cables, but the widely shared advice is simpler: go in good conditions, stay calm, take your time, and do not crowd the people ahead of you.
Arjun Mehta is the pen name behind Mountains Bliss — practical mountain-travel guides with routes, costs, seasons and safety notes, researched from real trekker discussions and cross-checked before publishing. No sponsored posts, ever.
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