What is the biggest threat to Yosemite National Park?

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.



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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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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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Each year, Yosemite National Park welcomes over four million visitors. If you're visiting Yosemite—particularly Yosemite Valley—during spring or fall, expect extremely high visitor concentrations, resulting in extended traffic delays, extremely limited parking, busy trails, and no lodging or campground availability.

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