How Many Black Bears Are in Maine? Population Details

Maine is home to roughly 36,000 black bears, the largest population of any state in the eastern United States. That estimate comes from the Maine Department of Inland Fisheries and Wildlife (MDIFW), which has tracked bear numbers through harvest data, field research, and population modeling for decades. The number alone, though, only scratches the surface of a story that involves shifting management philosophies, deep dependence on wild food supplies, and an ongoing balancing act between growing bear numbers and human tolerance.

How Maine Ended Up With So Many Bears

Maine’s bear population was not always thriving. For much of the early and mid-twentieth century, bears were treated more as pests than wildlife. The state paid bounties on bears killed in various parts of Maine from 1931 through 1957, and bears were classified as a game animal while still being bountied in parts of the state from 1941 to 1957.¹ Once the bounty was repealed in 1957, the attitude began to shift. Mandatory reporting of all bears killed started in the late 1960s, and by October 1969 every harvested bear had to be registered with the state.¹

Those changes marked the beginning of modern bear management in Maine. Instead of trying to reduce bears at every opportunity, wildlife managers started collecting the kind of data they needed to understand how many bears existed, how fast the population was growing, and how much harvest it could sustain. The combination of vast, largely unbroken forest habitat in northern and western Maine and increasingly science-based management allowed the population to climb steadily through the latter part of the twentieth century to where it stands today.

Where the Bears Are

Black bears are not evenly spread across Maine. The highest densities are in the northern and western interior, where tens of thousands of acres of mixed hardwood and softwood forest provide cover, denning sites, and food. The vast commercial timberlands of Aroostook, Piscataquis, and Somerset counties hold a disproportionate share of the state’s bears. Central Maine supports a moderate population as well, though bear density drops as the landscape gives way to more agricultural land and denser human settlement along the coast and in southern counties.

This distribution matters because bears in different parts of the state face different ecological conditions. Research on female black bears in Maine found that denning behavior varied significantly between study areas in northern Maine and one in central Maine. In the north, where American beech trees were common, den entry followed an alternate-year pattern tied to beechnut production: bears denned early in years when beechnuts were scarce and later in years when they were plentiful. In central Maine, where beech trees were less common, both den entry timing and habitat use were more consistent from year to year.² In other words, a bear’s life in Maine looks quite different depending on which part of the state it inhabits.

How Biologists Estimate the Population

Counting bears spread across nearly 18 million acres of forest is not straightforward. You cannot simply fly over and count them the way you might survey moose or deer in open terrain. Instead, MDIFW relies on a combination of methods. Harvest data forms the backbone: because every bear killed in Maine must be registered, the state has decades of detailed records on how many bears are taken each year, their age (determined by a tooth cross-section), sex, location, and the method used to harvest them. Age structure is especially valuable because it tells biologists whether the population is skewed toward younger animals (a sign of heavy harvest pressure) or contains a healthy proportion of older bears.

Field research adds another layer. Biologists have captured and collared bears across multiple study areas over the years, tracking survival rates, reproductive output, movement patterns, and denning behavior. More recently, stable isotope analysis of hair and blood samples has given researchers a window into what bears are eating without needing to follow them into the woods every day. Hair samples collected from bears captured between 2005 and 2019 were analyzed alongside potential food items, including hunting bait, to evaluate how different food sources contributed to individual bear diets across three study areas with varying levels of human influence.³ These isotopic tools allow researchers to answer questions about nutrition and food availability that would otherwise require invasive or impractical monitoring.

Population modeling pulls all of this together. Biologists feed the harvest data, survival estimates, reproductive rates, and food availability indices into mathematical models that estimate total population size and predict how it will respond to changes in harvest levels or habitat conditions. The current estimate of around 36,000 bears is the product of that modeling, not a one-time snapshot. It is refined as new data come in each year.

Why Beechnuts Shape Everything

If you spend time reading Maine bear research, one word keeps coming up: beechnuts. American beech is one of the most important hard mast species in Maine’s forests, and its nut crops are wildly inconsistent from year to year. In a good mast year, bears can pack on enormous amounts of fat in late summer and fall. In a poor year, they enter dens lighter, and the effects ripple through the population.

Research on bear foraging ecology in Maine found that body condition, measured by the hormone leptin in blood serum, was significantly better in bears that had access to abundant beechnuts. Total litter mass correlated positively with maternal leptin levels and negatively with markers indicating reliance on lower-quality foods, reinforcing how critical beechnut availability is to reproductive success.⁴ In practical terms, a female bear that gorges on beechnuts in September and October is more likely to produce healthy cubs the following winter than one that scraped by on berries and insects.

The same study found a positive correlation between body mass and dietary markers associated with higher-protein foods, suggesting that the largest bears in Maine may be using their size to access or defend richer food resources, including ungulate carcasses or even live prey like moose calves.⁴ Maine’s bears are not the berry-and-grub specialists people sometimes picture. The biggest individuals supplement their diet in ways that look more like small predators than passive foragers.

Beechnut failure also changes how bears interact with people. When natural foods are scarce, bears range more widely and are more likely to visit bird feeders, garbage cans, agricultural crops, and other human food sources. Years of poor mast production typically correspond with spikes in nuisance bear complaints and increased bear-vehicle collisions.

How Hunting Keeps the Population in Check

Maine allows black bear hunting through several methods: over bait, with dogs, by trapping, and during a general firearms and archery season. Hunting over bait, in which a hunter places food at a site and waits for a bear to visit, is by far the most productive method. Roughly 69% of all bears harvested in Maine are taken over bait.³ In the dense, vast forests of northern Maine, spot-and-stalk hunting is far less effective than it might be in more open western landscapes, so bait-based hunting plays an outsized role in the state’s ability to meet its harvest targets.

This has been politically contentious. A citizen referendum in 2014 sought to ban hunting bears with bait, dogs, and traps. Wildlife managers and hunters argued that removing those tools would effectively cut harvest rates so sharply that the population would grow beyond what the habitat and human communities could tolerate. The referendum failed, and the methods remain legal.

Research has examined the concern that feeding bears bait might inadvertently boost population growth by providing extra calories to reproductive females. A study analyzing hair samples from bears captured across 15 years found no evidence that a greater contribution of human food resources, including bait, increased the number of cubs per litter. The study also found no evidence that human foods made up a larger share of bear diets in years when natural foods were scarce.³ Hunting bait, in other words, appears to function as intended: it draws bears within range of hunters without meaningfully subsidizing the population it is supposed to control.

The probability of a reproductive-age female being harvested did show a weak positive association with dietary markers linked to high-carbon human foods like bait, but the relationship was not strong, likely due to sampling limitations. Harvest probability was higher, however, in years when natural food resources were scarce, suggesting that hungry bears are simply more vulnerable to hunters regardless of baiting.³

The Long Winter Underground

Maine’s bears spend a remarkably long time in their dens. Denning periods for individual bears ranged from 134 to 197 days in one long-term study, meaning some bears are underground for more than six months of the year.² Emergence in spring generally occurred during April, within about a week of the final snowmelt.² That tight link to snowmelt means emergence timing can vary by several weeks depending on the severity of the winter and the bear’s location in the state.

Pregnant females enter dens earliest and emerge latest because they give birth during hibernation, typically in January or February, and nurse cubs for weeks before the den opens in spring. A female that entered a poor mast year’s den lean will have less stored energy to draw on during this critical period, which is one of the reasons beechnut crop failures can echo through the population for years afterward in the form of smaller litters and lighter cubs.

Den sites themselves are varied. Bears in Maine use rock cavities, brush piles, excavated holes in hillsides, and occasionally the root systems of blown-down trees. Some dens are reused across years, while others are freshly dug each fall. The quality of the den matters less than many people assume. In fact, some Maine bears den in remarkably exposed sites and still survive the winter, though insulated dens are preferred when available.

How Maine Compares to the Rest of the East

Maine’s roughly 36,000 bears represent the largest concentration of black bears in the eastern United States. No other New England state comes close. Vermont, New Hampshire, and Massachusetts have growing but much smaller populations. Pennsylvania hosts a substantial bear population of its own, and the southern Appalachian region supports significant numbers in states like Virginia, North Carolina, and Tennessee, but none of these individual states rival Maine’s density relative to human population. Maine’s combination of roughly 1.4 million residents and 17 million acres of forest creates a ratio of bears to people that is unmatched in the East.

That ratio creates both opportunity and tension. Tourists and seasonal residents come to Maine partly for the wildness that bears represent, but full-time residents living on the edge of bear habitat deal with raided chicken coops, crushed beehives, and the occasional bear in the garage. The state walks a line between maintaining a bear population that supports a meaningful hunting season, satisfies ecological goals, and does not generate more human conflict than communities will accept.

Threats to Long-Term Stability

The single biggest ecological uncertainty for Maine’s bears is the future of American beech. Beech bark disease, caused by a combination of an invasive scale insect and a fungal pathogen, has been working through Maine’s forests for decades. Diseased beech trees often still produce some nuts, but heavily infected stands can decline in productivity and eventually die back. Because beechnut crops are so central to bear nutrition and reproduction, any large-scale loss of healthy beech stands could reduce the habitat’s carrying capacity for bears even if total forest acreage stays the same.

Climate change introduces additional uncertainty. Warmer winters could shorten hibernation periods, pushing bears into the landscape earlier in spring when food is still scarce. Shifts in the timing and productivity of berry crops, beechnut mast, and insect availability could scramble the seasonal food calendar that Maine’s bears have adapted to. Some researchers expect black bears will actually expand their range northward as forests change, but range expansion does not help if food quality declines within the existing core habitat.

Development pressure, particularly in southern and coastal Maine, is another factor. Bears are not well suited to fragmented suburban landscapes. As second-home construction and rural development push deeper into areas that were once continuous forest, habitat connectivity can erode. Bears need large home ranges, and males in particular may travel dozens of miles during breeding season. Fragmented habitat forces them across roads and through neighborhoods, increasing both vehicle collisions and the kind of close encounters that lead to bears being killed as nuisances.

Living Alongside Bears in Maine

If you live in or visit bear country in Maine, the practical advice is straightforward. Securing garbage in bear-resistant containers, taking bird feeders down from April through November, and not leaving pet food outside eliminates the three most common attractants. Bears that find easy food near homes quickly lose their wariness of people, and habituated bears are the ones most likely to end up euthanized after repeated conflicts. The old saying that a fed bear is a dead bear is not a slogan so much as a statistical observation about what happens to individual animals once they associate people with calories.

Beekeepers and backyard poultry owners in bear territory face a more persistent challenge. Electric fencing is the single most effective deterrent for both apiaries and coops, and MDIFW actively promotes and in some cases subsidizes its installation. Bears that have already learned to raid an unfenced coop or hive are very difficult to deter by other means. The fence needs to be up before the first visit, not after.

Encountering a bear in the woods is something many Maine hikers worry about but rarely experience in a dangerous way. Black bears are generally wary of people and will leave if given the chance. Loud noises, backing away slowly, and not running are standard guidance. Attacks on humans by black bears in Maine are extraordinarily rare, though they are not unheard of across the species’ range. The vast majority of human-bear encounters in Maine end with the bear running away before the person finishes reaching for a camera.