What to Know Before Hiking Half Dome


Hiking Half Dome is one of the most iconic and demanding day hikes in Yosemite National Park. The route is famous for its sweeping views, steep granite slabs, and the cable section that challenges even experienced hikers. Proper preparation is essential, not only to increase your chances of success, but to ensure a safe and enjoyable experience.

If Half Dome is on your Yosemite wish list, here is what you need to know before stepping onto the trail.

Understand the Permit System

A permit is required to hike Half Dome when the cables are up, typically from late May through October, depending on conditions.

There are two main ways to secure a permit:

  • Pre season lottery: Held in March, this is the primary opportunity to plan far in advance
  • Daily lottery: Available two days before your intended hike date

Permits are limited, competitive, and non transferable. You will need to have a recreation.gov account to apply for the permit lottery for both a one day and multi-day Half Dome hike

Know the Distance and Elevation

The Half Dome hike is long and strenuous.

From the valley floor, expect:

  • 17.2 miles round trip from the Valley floor
  • Around 5,3005feet of elevation gain
  • A full day commitment, often 10 to 14 hours

This is not a casual hike. Strong fitness, endurance, and mental preparation are required.

Train Before Your Trip

Half Dome is best attempted by hikers who are already comfortable with long days on steep trails.

Training should include:

  • Regular hikes with sustained elevation gain
  • Stair climbing or hill workouts
  • Building comfort hiking for many hours at a steady pace

The better prepared you are, the more you can enjoy the experience rather than just endure it.

Start Early

Early starts are critical for Half Dome success.

Most hikers begin before sunrise to:

  • Avoid afternoon thunderstorms
  • Beat heat on exposed granite sections
  • Give themselves ample time to complete the hike

Thunderstorms are common in summer and make the cables extremely dangerous. If storms threaten, turning around is the right decision.

Understand the Cable Section

The final ascent up Half Dome involves climbing a steep granite slab using fixed steel cables.

Important things to know:

  • Gloves are a must as they improve grip and comfort
  • Footwear with good traction is essential
  • Traffic can be slow during peak hours
  • Conditions can change quickly with weather

If you are uncomfortable with heights or exposure, this section may be mentally challenging.

Pack Smart and Light

Carrying the right gear can make or break your Half Dome hike.

Essentials include:

  • Plenty of water and electrolytes.
    • There is no potable water along the hike but you can filter out of the Merced River. Little Yosemite Valley will be your last place to refill water.
  • High calorie snacks and meals
  • Sun protection and layers
  • Headlamp for the early morning and after sunset

Water is available along the trail early in the season, but filtration is required and sources can dry up later in summer.

Respect Your Turnaround Point

One of the most important skills for Half Dome hikers is knowing when to turn back.

Reasons to stop early include:

  • Approaching storms
  • Fatigue or cramping
  • Running out of time or daylight

Reaching the summit is optional. Returning safely is not.

Consider a Guided Half Dome Hike

For many hikers, a guided experience adds confidence, structure, and safety. Guides help manage pacing, monitor conditions, and provide insight into the landscape along the way.

At Discovery Treks, our guides focus on preparation, smart decision making, and creating a supportive group experience for one of Yosemite’s most legendary hikes.

We offer both one-day and multi-day Half Dome adventures that will fit into your schedule. Click here to learn more about our Half Dome tour offerings.

Final Thoughts

Half Dome is a bucket list hike for a reason. It is challenging, rewarding, and unforgettable.

With the right preparation, realistic expectations, and respect for the mountain, hiking Half Dome can be one of the most meaningful adventures of your life.