Coastal brown bears are one of the largest land carnivores in the world with males weighing up to 1500 lbs. On average polar bears are larger but the largest bear ever weighed was an Alaskan brown bear over 1800 lbs. This guy is probably a mere 1000 lbs, and will probably be 200 to 300 more after the salmon season.
This sow is probably just over 500 lbs while her 2 cubs are near a 100 lbs at 14 - 16 mos old.
How large do Coastal brown bears get?
The size of course depends on the age and the sex of the bear. A brown bear male (also known as a boar) is usually fully grown at 8 years old, and gains about 100 lbs a year from 3 to 8. His final weight will be from 800 - 1000 pounds, but brown bear males over 1500 pounds have been measured. A female (aka sows) usually stops growing at 5 years old and weighs about 350 -500 pounds midsummer. Both the male and female can easily gain a couple hundred pounds from early summer to late fall when they go into hibernation. An interior brown or grizzly boar could range from 500 up to 700 (but that's very large) and a female will be from 3 to 500 lbs.
Why are the Coastal Brown Bears larger?
The larger predictable supply of the vegetation and berries growing along the coast helps, but it’s primarily the salmon diet that helps them attain and keep a large size. Not only are coastal brown bears up to twice as large as inland browns, their populations are up to 10 to 20 times denser than interior populations, another facet based on the abundance of food. Females tend to have larger litters and are more successful at raising them. The predictable supply of the high fat/protein salmon diet gives them a tremendous ability to succeed.