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Cooler Weather Brings Change In Behavior Of Black Bears

In the Tahoe Basin, the changing leaves and cooler temperatures can only mean one thing – fall is here. With the transition of the seasons, bears are changing their behavior as well.

In the fall, black bears enter a temporary physiological state known as “hyperphagia.” During hyperphagia, known colloquially as the fall feeding frenzy, bears consume as much as they can to bring their fat stores to a level where they can survive the quickly approaching winter months. In the fall, an adult bear can consume 20,000 to 24,000 calories a day and can gain multiple pounds per day.

To achieve this rapid growth in fat stores, wild bears can be seen foraging most of the day and night and may travel beyond their normal home range in search of food. The increased drive for food can lead bears to seek easy, calorie-dense meals in residential areas if food, garbage, and recycling are not properly stored. To keep the Tahoe bears wild while they bulk up for the winter, the Tahoe Interagency Bear Team reminds residents to stick to BearWise principles by using bear-resistant garbage carts/boxes, removing bird feeders, storing pet food inside, and cleaning grills regularly.

After the fall feeding frenzy, food supplies begin to dwindle, signaling to the bears it is time to find a den for hibernation. In the wild, bears will den beneath rock piles or hollowed trees. However, in the Tahoe Basin, many bears try to make a den under a deck or a crawl space. These insulated and wind-protected urban dens are enticing to bears seeking shelter but come at a big cost to homeowners. Bears wintering under homes often tear down insulation or electrical wires as part of their effort to build a warm nest. They also leave an opening to the den, exposing pipes to freezing temperatures that may burst and cause homeowners significant damage.

“Some insurance companies will pay for damage in a crawl space, but many won’t, so a lot of the burden can fall on the homeowner,” explained Rebecca Carniello, the Urban Wildlife Biologist at the Nevada Department of Wildlife (NDOW).

For more tips and information about what you can do to keep Tahoe bears wild, visit the California Department of Fish and Wildlife (CDFW) Keep Me Wild/Sharing Space Outdoors webpage, or

Use the following phone numbers and online resources to report a bear incident or conflict while camping or visiting the Tahoe Basin:

In California, contact the California Department of Fish and Wildlife (CDFW) at 916-358-2917 or report online using CDFW’s Wildlife Incident Reporting (WIR) system at

Non-emergency bear collisions in California State Parks can be reported to its public dispatch at 916-358-1300.

In Nevada, contact NDOW at 775-688-BEAR (2327).

If the issue is an emergency, call the local sheriff’s department or 911.

Learn more about the Tahoe Interagency Bear Team at