Most bears in Alaska emerge from hibernation between mid-April and late May, though the exact timing depends on the species, the bear’s sex, and whether a female has newborn cubs. In northern parts of the state, bears can be dormant for seven to eight months, making their spring emergence a gradual process that unfolds over several weeks rather than a single date on the calendar.
Brown and Grizzly Bear Emergence
Grizzly bears in Alaska typically begin leaving their dens in April, with the earliest sightings of adult males recorded as early as mid-March. A National Park Service study tracking radio-collared grizzlies in northwestern Alaska found that first emergence dates ranged from April 15 to May 2, but most bears weren’t observed moving away from their den sites until May 19 through June 1. That gap matters: bears often linger near their dens for days or even weeks before actively traveling and foraging, a phase researchers call “walking hibernation.”
Adult males come out first. Barren females (those without cubs) follow shortly after. Females with newborn cubs are consistently the last to emerge, with some not leaving the den until the third week of May. In the study, the latest documented emergence dates, between May 18 and 21, all belonged to mothers with cubs born that winter.
Black Bear Emergence
Alaska’s black bears follow a similar pattern. They enter dens in the fall once food becomes scarce and emerge in spring when vegetation starts growing again. In the northern part of their range, black bears may hibernate for seven to eight months, putting emergence somewhere in April or May depending on conditions. In more southern areas of the state, some black bears occasionally come out of their dens during winter, though this is uncommon. As with grizzlies, females with cubs tend to emerge later than solitary bears.
Polar Bear Denning and Emergence
Polar bears have a different cycle from their inland relatives. Only pregnant females den for an extended period, and they emerge earlier than most brown or black bears. On Alaska’s North Slope, polar bear mothers with newborn cubs leave their dens in mid-March on average. Data from two North Slope subpopulations put the mean emergence date at March 14 for one group and March 19 for the other. After emerging, mothers and cubs typically spend several days near the den site before heading toward sea ice.
What Triggers Emergence
Increasing daylight is the primary signal. As days lengthen in spring, bears’ metabolic rates begin to rise from the suppressed levels maintained during hibernation. Snowmelt and warming temperatures play supporting roles by making food accessible. South-facing slopes at lower elevations thaw first, and that’s exactly where black and brown bears tend to show up earliest in spring. The interplay of these factors explains why emergence timing varies from year to year and from one part of Alaska to another. A bear denning in the Brooks Range at high elevation will emerge weeks later than one wintering in Southeast Alaska’s milder coastal climate.
What Bears Eat After Leaving the Den
Bears emerge hungry but not desperate. Their bodies are still transitioning out of hibernation, and their digestive systems need time to ramp back up. Grizzlies in Arctic Alaska rely heavily on the starchy roots of a legume called alpine sweetvetch, digging them from well-drained tundra and riverbanks. They supplement these roots with overwintered berries, emerging green vegetation, and flower buds. Black and brown bears in more forested areas head for low-elevation south-facing slopes, riparian forests, and wetlands to find the earliest green plants and, when available, moose calves.
Females with cubs are especially sluggish in this period. Field observations of three mothers with newborn cubs found they were inactive most of the time through late May and into early June, staying close to the den and using it or nearby resting spots between short foraging bouts. This cautious behavior likely helps protect vulnerable cubs while the mother gradually rebuilds her energy.
What This Means for People in Bear Country
If you’re hiking, camping, or hunting in Alaska from mid-March onward, bears could be active in your area. Early-emerging males are especially mobile and may cover large distances looking for food. Spring bears are drawn to anything calorie-dense, so managing attractants is critical. Store food and meat well away from your camp with a clear line of sight between the two. Clothes stained with blood or animal fat should be treated like food and stored separately, never kept in your tent.
The window of concern widens as spring progresses. By late May, nearly all bears in a given area are out of their dens and actively foraging. South-facing hillsides, riverbanks, and wetlands with early vegetation are high-traffic zones during this period. If you encounter a bear near your camp, making loud noise, yelling, and banging pots together can drive it off. Carrying bear spray is standard practice in Alaska’s backcountry from spring through fall.