Quick answer
Most grizzly bears live around 20–25 years in the wild, though predation, disease, habitat quality, and (for pets) veterinary care shift individual outcomes.
Key takeaway
Most grizzly bears live around 20–25 years in the wild, though predation, disease, habitat quality, and (for pets) veterinary care shift individual outcomes.
Typical lifespan
Grizzly Bears (Ursus arctos horribilis) typically live around 20–25 years in the wild. Published averages mix wild and managed populations, so treat any single number as a planning range rather than a guarantee.
What shortens life
In the wild, grizzly bear mortality is driven by predation, competition, infectious disease, injury, and habitat loss. Food shortages and human conflict also cut average lifespan in many regions.
What supports longer life
Stable habitat, low chronic stress, and adequate nutrition support longevity. Where grizzly bears live alongside people, responsible management and veterinary care (for domestic or captive animals) matter as much as genetics.
Life stages
Juveniles face higher mortality than healthy adults. Seniors show slower movement, dental wear, and reduced body condition — useful field signs when comparing age classes.
How this compares
Body size and ecology shape longevity: larger mammals often live longer than small ones, but high-risk lifestyles (open hunting, migration) can reverse that pattern. Always compare like-with-like populations.
Diet and feeding
Despite their fearsome reputation, grizzlies are omnivores that eat far more plants than meat. They feast on berries, roots, nuts, insects, fish, and carrion, and famously gather at rivers to catch salmon during the run. In autumn a grizzly may eat for up to 20 hours a day, packing on fat before winter.
Hibernation
Grizzlies spend the harshest months in a den in a state of deep dormancy, living off the fat reserves they built up in autumn. Females give birth during this time, and tiny cubs nurse and grow in the den before emerging in spring. A bear's heart rate and metabolism slow dramatically while it sleeps.
Power and the body
A grizzly is built for strength, with a distinctive shoulder hump of muscle that powers its digging and a bite strong enough to crush bone. Despite their bulk, grizzlies can sprint at 56 km/h (35 mph) over short distances, faster than any human, and they are strong swimmers and capable climbers when young.
Conservation
Brown bears as a whole are listed as Least Concern, but grizzlies were driven out of much of their former range in the lower United States. They survive today mainly in protected areas such as Yellowstone and the northern Rockies, and recovery efforts continue to manage human-bear conflict.
Research notes
Figures for grizzly bears (Ursus arctos horribilis) come from field studies, museum records, and conservation assessments that do not always agree on exact averages. Prefer ranges over single-point claims, and check whether a source describes wild, captive, or mixed populations.
Practical takeaways
If you encounter grizzly bears in the wild, prioritise distance and local guidance. If you care for related domestic or captive animals, match diet and housing to species needs rather than generic pet advice. Share accurate status information (Least Concern) when discussing conservation.
Sources
FAQs
How Long Do Grizzly Bears Live?
Most grizzly bears live around 20–25 years in the wild, though predation, disease, habitat quality, and (for pets) veterinary care shift individual outcomes.
What is the scientific name of the grizzly bear?
Ursus arctos horribilis
What do grizzly bears eat?
Omnivore
Where do grizzly bears live?
Forests, meadows, and mountains
Are grizzly bears endangered?
Listed here as Least Concern. Check IUCN and national lists for the latest assessment.