Is Yosemite water safe to swim in?

Yosemite National Park offers a range of swimming opportunities—from rivers and lakes to our family-friendly pools, which are the only swimming places in Yosemite with lifeguards. River and lake swimming is at-your-own-risk. Life jackets are strongly recommended—especially for children.



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Viruses aren't common in Yosemite's waters, but we recommend that you treat water to kill them.

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Water quality throughout Yosemite National Park is considered to be good and is generally above state and federal standards.

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Showers are available at the Curry Village pool showerhouse for a fee. Showers are not available elsewhere in the park. Dump stations are available at Upper Pines Campground (all year), near Wawona Campground (summer only), and near Tuolumne Meadows Campground (summer only).

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Even if you don't plan on hiking across any streams or rivers, waterproof hiking shoes are a great comfort in Yosemite. As we have mentioned, springtime signals the melting of snow and this causes many trails in Yosemite to have patches of water and ice.

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Invasive species have a negative impact on natural resources nationwide, including in Yosemite National Park. Non-native animal species, like the New Zealand mud snail, concern park scientists because this species can completely cover a river streambed, thereby altering the ecosystem.

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The risk for mosquito activity is extremely high. Wear long-sleeved shirts and pants when spending time outdoors to prevent bites.

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Stay away from river and creek banks during high water conditions and avoid rock hopping. Stream polished rocks along the water's edge may be slippery when wet or dry. If you choose to cross a stream without a bridge, avoid deep and/or swift water.

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In Yosemite's case, most precipitation falls as snow that accumulates above 6,000 feet (1,830 meters) during the winter, creating a natural water reservoir. The snowpack slowly releases meltwater through the spring and early summer, nourishing downstream regions well into the dry season.

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Bear Attacks Attacks are rare—nobody has been killed or seriously injured by a bear in Yosemite. If a black bear approaches, always follow the above guidelines. If a black bear attacks while you're in Yosemite, fight back.

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Elevation plays a major role in temperature and precipitation variability. Since Yosemite varies in elevation from 2,000 feet to over 13,000 feet, the lower foothills of the park can be experiencing the rebirth of spring while the higher elevations remain in the grip of winter.

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American black bears found in Yosemite National Park have long been of intense interest to park visitors and managers. Seeing one of the approximately 300 to 500 black bears in Yosemite can evoke excitement, awe, and fear. If visitors spot a bear while in the park, it is a black bear-not a brown or grizzly bear.

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May through September is the most popular time in Yosemite These months correspond with the best weather and are also when all the roads, trails, lodging, shuttles and attractions in the park are open. That includes its most famous drive, Tioga Rd, a 64-mile-long scenic byway that closes when the snow begins to fall.

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Within Yosemite National Park, you may not sleep in your car or RV except in a campsite that you're registered to stay in (except at Camp 4, where sleeping in cars is not allowed because it's a walk-in campground). Sleeping in your car along the side of the road is not allowed.

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Horsetail Fall is a small, ephemeral waterfall that flows over the eastern edge of El Capitan in Yosemite Valley. For two weeks in February, the setting sun striking the waterfall creates a deep orange glow.

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At 620 feet, Bridalveil Fall is often the first waterfall visitors see when entering Yosemite Valley. As one of the easier hikes in the Valley, Bridalveil Fall is the perfect attraction for visitors looking for minimal effort in return for maximum views.

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