A black bear “phase” refers to a coat color variation within the American black bear species. Despite the name, black bears come in more colors than any other North American mammal: black, brown, chocolate, cinnamon, blonde, blue-gray, and even white. These color variations are called “phases” or “color morphs,” and they’re all the same species, Ursus americanus.
Why Black Bears Come in Different Colors
Color phases are driven by genetics, not diet or environment. The gene responsible for coat color in black bears is the same one that controls pigment production in many mammals. In the case of the white-phased “Kermode” bear found in British Columbia, researchers pinpointed a single change in this pigment gene: a recessive mutation that, when inherited from both parents, produces a completely white coat. Other color phases likely follow similar genetic patterns, though the cinnamon morph in particular appears at high frequency in the American Southwest, suggesting regional evolutionary pressures play a role.
One leading theory is that lighter-colored bears may blend in better with open, sunlit landscapes in the western mountains, while darker coats provide better camouflage in the dense, shaded forests of the East. This could explain the stark regional differences in color phase frequency. In eastern North America, the vast majority of black bears are actually black. Move west into the Rockies and the Southwest, and brown, cinnamon, and blonde bears become far more common.
The Common Color Phases
The classic black phase is what most people picture: solid black fur, sometimes with a brown muzzle or a small white chest patch. This is the dominant color across most of the species’ range.
Chocolate phase: These bears have a brown, chocolaty coat that ranges from dark brown to a lighter milk-chocolate shade. They’re relatively easy to spot once you know what to look for, though they’re often mistaken for young grizzlies.
Cinnamon phase: A blend between chocolate and blonde, cinnamon bears have a reddish-brown appearance. Many have darker fur on their heads with lighter brown along their sides, giving them a two-toned look. This is one of the most common non-black phases in western states.
Blonde phase: Blonde black bears range from very light brown to nearly white. They’re striking in the wild and can easily be confused with other species at a distance.
The Rare Phases: Spirit Bears and Glacier Bears
Two color phases are rare enough to have their own common names. The Spirit bear (also called the Kermode bear) is a white-phased black bear found along the northwest coast of British Columbia. These bears aren’t albinos. They have brown eyes and dark skin, but their fur is cream to pure white thanks to that recessive pigment gene mutation. Spirit bears are one of the most striking color variations found in any mammal, and they hold deep cultural significance for Indigenous communities in the region.
The glacier bear, sometimes called the blue bear, is found only in northern Southeast Alaska and a small sliver of western Canada. Their fur ranges from white to gray to black, with silver-tipped guard hairs that give the coat an overall blue-gray shimmer. The National Park Service identified four glacier bear populations clustered around Lynn Canal and Glacier Bay, with a curious gap in the non-glaciated peninsula between them. These bears are genuinely uncommon, and sighting one is considered a rare event even for researchers working in the area.
How to Tell a Color Phase Bear From a Grizzly
This is where color phases create real confusion. A cinnamon or chocolate black bear can look remarkably similar to a brown bear (grizzly), and Alaska’s Department of Fish and Game explicitly warns that color alone is not a reliable way to tell the two species apart. Instead, you need to look at body shape and features.
- Facial profile: Black bears have a straight facial profile from forehead to nose. Grizzlies have a concave, dish-shaped face.
- Shoulder hump: Grizzlies have a prominent muscular hump above their shoulders. Black bears lack this hump or have a very slight one.
- Claws: Black bear claws are sharply curved and rarely longer than an inch and a half. Grizzly claws are longer, straighter, and more visible from a distance.
- Ears: Black bears have taller, more pointed ears relative to their head size. Grizzly ears appear shorter and rounder.
These differences hold true regardless of fur color. A blonde black bear with a straight face and no shoulder hump is still a black bear, and a dark-furred grizzly with a dished face and prominent hump is still a grizzly.
Can a Bear’s Color Change Over Time?
A bear’s genetic color phase stays the same throughout its life, but the appearance of its coat can shift with the seasons. Sun exposure can bleach fur lighter over the summer months, and the annual molt replaces old, faded fur with fresh growth that often looks darker or richer. A cinnamon bear might appear noticeably lighter by late summer compared to how it looked after emerging from its den in spring. Cubs can also change shade as they mature, sometimes starting darker and lightening as their adult coat grows in.
Bears within the same litter can even be different color phases. A black mother can produce both black and cinnamon cubs if she carries the genetic variants for lighter coloring, which sometimes leads to the mistaken assumption that the lighter cub belongs to a different species.