On Kodiak Island, where misty mountains rise above salmon-filled rivers, the Kodiak brown bear reigns as one of nature’s true giants. Known for its impressive strength and sheer size, this subspecies of brown bear (Ursus arctos middendorffi) has fascinated wildlife enthusiasts, photographers, and scientists for decades.
But just how heavy are these bears—and how do they compare to others around the world?
The Massive Weight of the Kodiak Brown Bear
Kodiak bears are among the largest omnivores on Earth. Adult males typically weigh 800 to 1,200 pounds (360–545 kg), with some exceptional individuals exceeding 1,500 pounds (680 kg) in late summer and fall when they’ve fattened up for hibernation. Females are smaller, usually ranging from 400 to 700 pounds (180–320 kg).
The key to their size lies in abundance. Kodiak Island’s ecosystem provides a feast—salmon runs, lush vegetation, and access to coastal food sources allow these bears to reach their record-breaking weights without needing to compete with other large predators.
How Kodiak Bears Compare to Other Bear Species
While the Kodiak bear often takes the title of “largest bear,” it actually shares that honor with another heavyweight—the polar bear.The Kodiak bear is the largest brown bear, the polar bear the largest of all.
| Bear Species | Ave. Male Weight | Ave. Female Weight | Notable Features |
|---|---|---|---|
| Kodiak Brown Bear | 800–1,200 lbs | 400–700 lbs | Lives only on Kodiak Island, Alaska |
| Polar Bear | 900–1,600 lbs | 400–700 lbs | Marine mammal, strongest swimmer |
| Grizzly Bear | 400–790 lbs | 290–400 lbs | Inland cousin of the Kodiak, smaller due to limited diet |
| American Black Bear | 150–600 lbs | 100–400 lbs | Found across North America, highly adaptable |
| Asiatic Black Bear | 130–400 lbs | 90–250 lbs | Distinctive white chest marking |
| Giant Panda | 200–300 lbs | 150–220 lbs | Bamboo specialist from China’s mountains |
Although polar bears can sometimes edge out Kodiaks in sheer weight, Kodiak bears are generally bulkier in build. Their powerful shoulders and heavy frames reflect a life of digging, foraging, and defending territory on solid ground.
Seasons of Change: How Weight Fluctuates Throughout the Year
Kodiak bears live by the rhythm of the seasons. In spring, after emerging from hibernation, they’re at their leanest. As summer progresses and salmon fill the rivers, their bodies rapidly recover. By late autumn, these bears have gained hundreds of pounds—sometimes adding up to 30% of their body weight in preparation for the long Alaskan winter.
This cycle is critical for survival. A well-fed Kodiak bear can endure months of hibernation without eating, living off stored fat until spring’s thaw signals the return of abundance.
Witnessing the Giants Firsthand
There’s nothing quite like seeing a Kodiak bear in person. Standing within the wild heart of Alaska, surrounded by the scent of spruce and sea air, you understand why these animals inspire awe. Their power is matched only by their calm confidence—a presence that commands respect without aggression.
For those who visit the Kodiak Bear Center, these encounters are not just sightings—they’re moments of connection. Each observation helps deepen our understanding of these magnificent animals and supports ongoing conservation efforts that ensure future generations will know the giants of Kodiak Island.
Content Author & Alaska Photographer
I lead photography workshops at the Kodiak Brown Bear Center and create engaging, high-quality content for blogs and websites across Alaska and beyond. My deep passion for wildlife—especially Kodiak bears—continually inspires my work and fuels my storytelling.