Here is a break down of how much water you should bring: 1 gallon (4 liters) if hiking to the top of Half Dome. 2 quarts (2 liters) if hiking only to the top of Nevada Fall. 1 quart (1 liter) if hiking only to the top of Vernal Fall.
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The National Parks Service describes Half Dome as the most strenuous day hike in Yosemite, and probably the toughest (recommended) day hike in any National Park. So while you can certainly just show up and give the hike a go, you'll enjoy it more if your fitness level is up to snuff.
Our water is perfectly safe to drink, bath and swim in, but we recommend that you bring bottled water for drinking, due to the fact that our water has a high mineral content.
Best Time to Visit: You can't climb Half Dome unless the cables are up, which is generally from late May or early June through Columbus Day weekend in October. The waterfalls will be better the earlier in the year you go. Avoid Half Dome on days when there are thunder clouds in the area - it's not worth the risk.
Half Dome has an elevation of 8,844 feet and sits 4,737 feet above the valley floor. It takes an equivalent 473 flights of stairs to reach the top, which means 118 trips from the First Floor Lantern to the McFadden-Willis Reading Room.
The National Park Service considers ascending the 4,800 feet and traveling the minimum 14.5 miles to Half Dome's summit, “one of the most challenging day hikes in any national park.” Measured by vertical ascent, hiking Half Dome is roughly three times as challenging as hiking Angels Landing, and even includes a 7-mile ...