Many mosquitoes are most active at dusk and dawn, mainly during the summer. Be sure to use insect repellent and wear long sleeves and pants or consider staying indoors during these hours.
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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.
Global climate change is impacting Yosemite. Worldwide emissions of greenhouse gases trap heat in the atmosphere, leading to rapid warming observed across the western US. Scientists project that average temperatures in the park may rise by 6.7–10.3°F between 2000 and 2100.
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.
Make sure you know before you go. In national parks where grizzlies live, such as Glacier or Grand Teton, rangers encourage you to carry bear spray. In others, such as Yosemite, where only black bears live, bear spray is not even permitted.
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.
While true altitude sickness is normally only the concern of mountaineers heading for high summits, you can experience mild symptoms from the elevation in Yosemite—headaches, shortness-of-breath, and the like—as low as 5,000 feet. Staying a step ahead of altitude sickness means taking things slow.
Many mosquitoes are most active at dusk and dawn, mainly during the summer. Be sure to use insect repellent and wear long sleeves and pants or consider staying indoors during these hours.
Mountain lions—also called cougars, pumas or panthers—roam Yosemite's mountains and valleys. These important predators, native to the Americas, are a natural part of the Yosemite landscape.
Where to See Yosemite Bears. Black bears are scaredy cats. They mainly stay away from humans, but you have a good chance of seeing one in Yosemite National Park among oak trees and meadows. Since they don't like being around humans, black bears live and travel in heavily wooded areas.
These large individuals of the Mountain Coyote are the present day wolves of the Yosemite region. No true wolf is known to have occurred anywhere in middle California since about 1870.
If a bear approaches you or if you are in a campground, picnic area, parking lot, lodging area, or other developed area, act immediately to scare it away. Scare the bear away by yelling aggressively and as loudly as possible until the bear leaves.
A sturdy pair of hiking boots or runners will protect your feet and ensure maximum comfort while you're exploring on foot. Try to bring a pair of boots that support your ankle and have decent grip to prevent slips and trips. If you're buying new boots, make sure you break them in before you go.