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!
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.
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).
Within the boundaries of Yosemite flow the headwaters and significant stream reaches of the Tuolumne and Merced Rivers, both of which are tributaries of the San Joaquin River basin.
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.
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.
Here are some quick tips to help you be safe while hiking in Yosemite: Carry a headlamp on every hike, even short day hikes. Carry and drink plenty of water (a minimum of 1 quart every 2 hours)
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.
May through September is the most popular time in YosemiteThese 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.
While California's air pollution regulations are among the strictest in the country, topography and geography combine to trap air pollutants in its Central Valley. Westerly winds often blow that pollution into Yosemite, especially during the summer.
The restroom at the Yosemite Valley Stables is accessible, the Wawona Stable has an accessible portable toilet, but the restroom at the Tuolumne Meadows Stable is not accessible.