How long do grizzlies hibernate?

Grizzlies (Ursus arctos horribilis) typically hibernate for 5-8 months each year. They enter their dens in the fall, usually around October or November, and emerge in the spring, around March or April. During hibernation, grizzlies sleep for long periods of time and their body temperature drops significantly. They do not eat or drink during this time, but rely on their stored body fat to survive. When they emerge from their dens in the spring, they are typically very hungry and will actively search for food.