Yes, woolly mammoths lived in North America for roughly a million years. They first crossed into the continent from Asia over the Bering Land Bridge, a vast stretch of now-submerged land connecting Siberia to Alaska, and eventually spread as far south as present-day Kansas and as far east as the American Midwest and Eastern Canada.
How They Got Here
The first mammoths crossed the Bering Land Bridge into North America around 1 million years ago. During ice ages, so much water was locked in glaciers that sea levels dropped dramatically, exposing a wide corridor of dry land between the two continents. This region, known as Beringia, wasn’t a narrow bridge but a broad, grassy landscape hundreds of miles wide. Mammoths grazed their way across it over many generations, gradually expanding into the interior of the continent.
Where They Lived
Woolly mammoth fossils have turned up across a wide swath of North America. Their core territory stretched from Alaska and the Yukon down through the northern Great Plains and into the Midwest, with remains also found in Eastern Canada. Their southernmost range reached into what is now Kansas. Fossils have even been recovered from Santa Rosa Island off the coast of California, though island mammoths were a separate, dwarfed population.
North America wasn’t home to just one type of mammoth. The woolly mammoth occupied the cold, dry landscapes near the ice sheets, while the larger Columbian mammoth roamed the temperate grasslands and forests farther south. These two species overlapped in parts of their range and, based on genetic evidence from a specimen found in Fairview, Utah, occasionally interbred. A Columbian mammoth from that site carried mitochondrial DNA more closely related to woolly mammoths than expected, suggesting hybridization happened across thousands of miles from the known boundary between the two species.
Built for the Cold
Woolly mammoths were thoroughly engineered for frigid environments. They had thick fur, oily skin, a layer of insulating blubber, and notably small ears and tails to minimize heat loss. But one of the most remarkable adaptations was invisible: their blood. Researchers reconstructed mammoth hemoglobin from 43,000-year-old DNA preserved in Siberian permafrost and found three amino acid changes not present in modern Asian or African elephants. These changes allowed mammoth hemoglobin to release oxygen to tissues even at very low temperatures, meaning their bodies could function efficiently in cold that would leave their elephant cousins struggling.
What They Ate
The North American landscape woolly mammoths inhabited is sometimes called the “mammoth steppe,” a vast grassland ecosystem with no modern equivalent. Studies of gut contents, preserved dung, and tooth enamel show that mammoths ate a varied diet. Nutrient-dense flowering plants called forbs were a staple, alongside grasses and sedges that could grow up to three feet tall. They also browsed on deciduous shrubs (preferring them over evergreen varieties), supplemented by tree material, mosses, lichens, and even green algae. Seeds from both tundra and boreal plant species have been found inside mammoth guts, suggesting they moved between different vegetation zones or lived in areas where these habitats overlapped.
Living Alongside Humans
Woolly mammoths and early humans shared the North American landscape for at least a few thousand years. Archaeological sites hint at interactions between the two, though the nature of those encounters is debated. The La Prele Mammoth Site in Converse County, Wyoming, contains mammoth remains alongside stone tools from the Clovis culture, one of the earliest widespread human groups in the Americas. Whether sites like these represent deliberate mammoth hunts or opportunistic scavenging of already-dead animals remains an active question among researchers. Some scientists argue that the spatial overlap of artifacts and bones proves hunting, while others point out that proximity alone doesn’t confirm it.
When They Disappeared
Woolly mammoths vanished from the North American mainland between about 14,000 and 10,500 years ago, during a period of rapid warming at the end of the last ice age. The grassland ecosystems they depended on shrank and fragmented as forests expanded and temperatures rose. Human hunting pressure likely compounded the problem, though its relative importance is still debated.
Small populations held on far longer in isolated pockets. On St. Paul Island, a small island in Alaska’s Pribilof group that was cut off from the mainland by rising seas, mammoths survived until about 5,600 years ago. Their extinction there had nothing to do with humans, who didn’t set foot on the island until 1787 CE. Instead, five independent lines of evidence point to freshwater scarcity as the killer. As the island shrank with rising sea levels and the climate dried out, the freshwater lakes mammoths depended on dwindled. The mammoths themselves likely made things worse by trampling the muddy banks and degrading what little water remained. The last woolly mammoths anywhere on Earth survived on Russia’s Wrangel Island until about 4,000 years ago.
A Frozen Time Capsule From the Yukon
In 2022, a gold miner working at Eureka Creek in the Yukon spotted something unusual in the permafrost: a trunk. The discovery turned out to be Nun cho ga, a baby woolly mammoth roughly one month old when she died more than 30,000 years ago. She is the most complete mammoth ever found in North America, measuring about four and a half feet from tail to trunk, with her skin, fur, ears, tail, and the tiny prehensile tip of her trunk all intact. Permafrost had acted as a natural freezer, preserving soft tissue, hair, and DNA in a way that fossilization in warmer climates never could. She may be in even better condition than the famous Siberian calf Lyuba, which was missing its tail when discovered. Nun cho ga is only the second essentially complete baby mammoth found anywhere in the world.