Is it safe to swim in Yosemite?

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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Be aware that mountain water is extremely cold, despite hot air temperatures. Strong swimmers may quickly become too weak from hypothermia to swim. Even professional swiftwater rescuers wearing layers of insulation sometimes struggle to stay warm!

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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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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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BASE jumping is prohibited. Hang gliding is allowed with a permit. Launching, landing, or operating an unmanned aircraft from or on lands and waters administered by the National Park Service within the boundaries of Yosemite National Park is prohibited.

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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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Lodging options inside Yosemite National Park are managed by Yosemite Hospitality, and range from simple tent cabins at the High Sierra Camps to deluxe rooms at The Ahwahnee. Reservations are available 366 days in advance and are strongly recommended, especially from spring through fall and during holidays.

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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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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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The deer mouse (Peromyscus maniculatus) is the primary reservoir for Sin Nombre Virus, the strain of hantavirus responsible for the human cases in Yosemite National Park, and most human cases in the United States.

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