(Bear spray/pepper spray is not allowed in Yosemite.) If you have food out and are having trouble scaring the bear away, pack up all your food and leave the area.
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Some rules vary between National Parks and National Forests. Can I bring a weapon or firearms into the parks? Weapons (including, but not limited to, BB, Pellet and Paint Guns, Bow/Arrow, Slingshots, Bear Spray and other compressed gas irritant devices) are illegal to possess.
NOTE: Bear spray is not allowed in every national park.Check with your national park to see if bear pepper spray is recommended or allowed for the activities you have planned. Having bear spray isn't useful if you don't know how to use it!
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.
About 300-500 black bears live in Yosemite's 750,000 acres. (Grizzly bears no longer live in California.) A black bear's diet consists mainly of berries, grasses, nuts, and insects.
If you do any hiking or camping in Yellowstone, you SHOULD bring bear spray. Generally, you don't need bear spray when visiting the popular and crowded geyser areas and villages, such as Old Faithful and Canyon Village.
If you have a trip planned to Yosemite National Park this summer, go ahead and leave the bear spray at home. It's not allowed within park boundaries. Bear spray is actually considered a weapon according to the park's regulations.