Are There Mountain Lions in the Eastern US? The Evidence

What happened to the eastern cougar?

Cougars once lived across the whole eastern half of North America, from Maine and New Brunswick to the Carolinas and the Gulf Coast. European settlers cleared forests, hunted out deer and paid bounties for killing large predators. By the late 1800s cougars were gone from most of the East.

The last confirmed eastern cougars outside Florida were killed in New Brunswick in 1932 and in Maine in 1938. In 2011, after reviewing decades of reports, the US Fish and Wildlife Service concluded that the eastern cougar had probably been extinct since the 1930s. It was formally removed from the endangered species list in 2018, because an extinct animal cannot be protected.

Scientists debate whether the eastern cougar was ever a separate subspecies. Genetic studies suggest all North American cougars belong to one group, so cougars that move east today are essentially the same animal that once lived there. For more on the names and subspecies, see are cougars and mountain lions the same?

The Florida panther: the East’s only breeding population

The Florida panther is a population of cougars that survived in the swamps and forests of southern Florida. It lives mainly around Big Cypress National Preserve, the Florida Panther National Wildlife Refuge, Fakahatchee Strand and nearby ranchland, with some animals in Everglades National Park. It occupies only about 5 percent of its historic range.

By the 1970s and 1980s, only about 20–30 panthers remained, and inbreeding caused heart defects, kinked tails and poor fertility. In 1995, eight female cougars from Texas were released to add new genes. The rescue worked: the population now numbers an estimated 120–230 adults and subadults.

Panthers still face serious threats. Collisions with vehicles kill many each year, and fast-growing development in southwest Florida fragments their habitat. Most of the population lives south of the Caloosahatchee River, and a female was confirmed north of the river in 2016, an important sign that breeding range could expand. Read about the panther’s neighbors in Everglades wildlife.

Confirmed wanderers from the West

Cougars that appear in the Midwest and East today are almost always young males that have dispersed from western populations, especially the Black Hills of South Dakota. Young males are forced out by older males and can walk hundreds or even thousands of kilometers looking for territory and a mate.

The most famous case is the “Connecticut cougar”. In June 2011, a young male was killed by a car in Milford, Connecticut. DNA showed he came from the Black Hills and had been detected along the way in Minnesota, Wisconsin and New York. He had traveled about 2,400 km (1,500 mi), one of the longest land journeys recorded for any mammal in North America.

Other confirmed cougars, identified from DNA, trail cameras, carcasses or clear tracks, have turned up in states such as Missouri, Iowa, Illinois, Indiana, Kentucky, Tennessee, Arkansas, Louisiana and Michigan. Since 2015, a few young females have also been confirmed in states such as Tennessee and Missouri, which matters because new populations can form only where females settle.

In 2025, Michigan biologists verified photos of two cougar kittens in the Upper Peninsula, the first evidence of cougar breeding in the state in more than a century. In 2026, Minnesota also reported evidence of cougars reproducing in the north of the state. These are small beginnings in the upper Midwest rather than in the eastern states.

Why most sightings are mistaken

Every year, people in the East report thousands of “mountain lion” sightings, but very few are confirmed. Most turn out to be other animals:

• Bobcats, which are common across the East but much smaller and have a short tail; see bobcat
• House cats photographed with nothing nearby to show their size
• Dogs and coyotes, especially tawny ones seen briefly at dusk
• Deer, foxes and even fishers glimpsed in poor light

Size is very hard to judge in a quick sighting or a trail-camera photo. The key feature of a real cougar is its very long, thick tail, often about a third of its total length, with a dark tip. Cougar tracks are round, about 7.5–10 cm (3–4 in) wide, and usually show no claw marks, unlike dog and coyote tracks.

Wildlife agencies treat a report as confirmed only with hard evidence, such as a clear photo that can be verified on site, a carcass, DNA from hair or scat, or a set of tracks examined by a biologist.

Will cougars come back to the East?

Biologists expect cougars to keep spreading slowly eastward, because deer are plentiful and large areas of forest have regrown. The slow part is females: they usually settle within a short distance of where they were born, so new breeding groups form much more slowly than male sightings suggest.

Studies have identified large areas of potentially suitable habitat in places such as the northern Appalachians, the Adirondacks and northern New England. Whether cougars will ever return there on their own, and how people will accept them, remains an open question.