Bears typically hibernate for a period ranging from about 2 to 7 months, depending largely on their species, geographic location, climate, and environmental conditions.

• In colder northern regions such as Alaska and northern Canada, bears can hibernate for about 5 to 7 months, sometimes up to 7.5 months for black bears and Alaskan brown bears

. For example, bears in northern Alaska hibernate around 7 months, whereas those in warmer coastal areas hibernate for 2 to 5 months, with longer hibernations for females raising cubs

• Grizzly bears usually hibernate between 5 to 7 months, while black bears can hibernate up to 7.5 months without eating, drinking, or defecating

• In milder climates or coastal regions, bears may hibernate for shorter periods, sometimes only 2 to 5 months, or may not hibernate at all if food remains available

• The timing and length of hibernation are influenced by factors such as temperature, food availability, and disturbances. For example, warmer temperatures can shorten hibernation by several days, and food scarcity can cause bears to emerge early or interrupt hibernation

• Bears do not hibernate in the classical sense of drastically lowered body temperature; instead, they enter a state called torpor or winter dormancy where their metabolism slows, heart rate decreases, but body temperature remains relatively high compared to other hibernators

In summary, bear hibernation lasts roughly from 2 to 7 months, with longer durations in colder climates and shorter or no hibernation in warmer areas. The average hibernation period for black and grizzly bears is about 4 to 7 months, typically spanning from late fall (October or November) to early spring (March or April)