The taiga, also called boreal forest, stretches across the northern reaches of North America, Europe, and Asia in a broad band roughly between 50°N and 70°N latitude. It is the world’s largest land biome, forming an almost continuous belt of coniferous forest across three continents just south of the Arctic tundra.
North America
In North America, the taiga occupies much of Canada and Alaska. It spans from the interior of Alaska eastward across the Yukon, the Northwest Territories, and most of the provinces from British Columbia to Newfoundland and Labrador. True taiga stops just north of the southern Canadian border. Related transitional forests exist in the northern tier of the lower 48 U.S. states (Minnesota, Wisconsin, Maine), but these are not considered full taiga.
Eastern North America receives some of the highest precipitation found anywhere in the taiga, exceeding 100 cm (about 40 inches) per year. The western and interior portions are drier, typically receiving 30 to 50 cm (12 to 20 inches) annually.
Europe
Most of Finland, Sweden, and Norway are covered with taiga. The forest extends across Scandinavia and into western Russia, where Scots pine is one of the most common trees. A small, isolated pocket of boreal forest also exists in the Scottish Highlands. It lacks some continental species but still contains Scots pine, the single most widespread conifer across the entire Eurasian taiga. Northern Europe, like eastern North America, receives relatively high precipitation compared to interior regions of the biome.
Asia
The vast taiga of Asia extends across Russia, making up the largest continuous stretch of this biome on Earth. Russian taiga runs from the Ural Mountains eastward to the Pacific coast. It also pushes southward into northeastern China and Mongolia. East of the Yenisei River in Siberia, the climate becomes so extreme and permafrost so widespread that vast areas are dominated by larch, a conifer unusual for being deciduous: it drops its needles each fall, an adaptation to the severe continental cold.
Interior Siberian taiga is among the driest in the world, with annual precipitation at low elevations dropping to 30 cm (about 12 inches) or less. Winter temperatures in these continental interiors are also the harshest, with January averages plunging well below −10 °C (14 °F).
Climate Across the Taiga
The taiga is defined by long, cold winters and short, mild summers. Mean annual temperatures range from a few degrees above freezing down to −10 °C (14 °F) or colder. January averages are generally below −10 °C across the biome, while July temperatures typically fall between 15 and 20 °C (59 to 68 °F). Total yearly precipitation ranges from about 25 to 75 cm (10 to 30 inches), though wetter coastal areas can exceed that. Snow covers the ground for much of the year, and the frost-free growing season can be as short as 130 days.
Soils and Permafrost
Taiga soils are generally thin, acidic, and nutrient-poor. The dominant soil type across much of the biome is podzol, a sandy, pale-colored soil formed when cold, acidic water leaches minerals downward through the soil layers. Podzols are low in phosphorus and potassium, which limits the types of plants that can thrive. In Siberia and parts of northern Canada, permafrost (permanently frozen ground) lies beneath the surface, restricting root growth and drainage. Where permafrost is continuous, larch forests dominate because larch can survive with shallow root systems in waterlogged, frozen ground.
Differences Between North American and Eurasian Taiga
The taiga looks similar on both continents at a glance, with spruce, pine, fir, and larch forming dense stands. But the specific tree species differ. North America’s taiga features black spruce, white spruce, balsam fir, and jack pine, while Eurasia’s forests are built around Scots pine, Siberian spruce, and Siberian larch. Interestingly, the mammals are more similar across continents than the plants. Wolves, bears, moose, and lynx inhabit both the Canadian boreal forest and the Russian taiga, often as the same or closely related species.
Wildlife Adapted to Taiga Conditions
Animals in the taiga have evolved striking strategies for surviving months of deep cold and limited food. Caribou grow dense coats of hollow hairs that insulate against extreme temperatures and help them stay buoyant when crossing rivers and lakes. Their hooves splay outward to act as natural snowshoes. Moose are so large that cold rarely threatens them. Their bigger problem is actually summer heat, which drives them into lakes and marshes to cool off and escape mosquitoes.
Wolves rely on excellent fur insulation, allowing them to hunt on all but the most brutal days. Bears, marmots, and jumping mice take a different approach entirely: hibernation. Smaller mammals like voles and ermine spend much of winter beneath the snowpack, where temperatures stay relatively stable compared to the air above. Flying squirrels burrow into snow-covered branch tangles, and ptarmigan dive from trees into soft snow to wait out cold nights.
Several species change color with the seasons. Ermine, snowshoe hare, and ptarmigan turn white in winter, making them harder to spot against the snow whether they are hunting or being hunted. Snowshoe hares and lynx both have oversized, fur-covered feet that act as snowshoes. Some small birds, including grosbeaks, crossbills, and redpolls, have special throat pouches they fill with seeds before roosting, giving them fuel to survive the long, dark nights when foraging is impossible. Many bird species skip winter altogether, migrating south after nesting during the brief boreal summer.
How the Taiga’s Boundaries Are Shifting
The taiga’s edges are not fixed. At its northern boundary, where forest gives way to treeless tundra, satellite data from 1984 to 2020 shows increasing tree canopy cover, with the strongest gains occurring in transitional landscapes near the cold northern edge. Arctic amplification (the faster warming of high latitudes compared to the rest of the planet) is pushing trees and tall shrubs into areas that were previously open tundra. A 2024 study in Communications Earth & Environment found that this shift is consistent across multiple climate scenarios and is projected to persist through 2100 across North America. The result is a more gradual transition from dense boreal forest to tundra, with vegetation growing taller and denser in what were once the taiga’s most sparse outer margins.