Coniferous forests stretch across every continent except Antarctica, but the vast majority grow in a broad band across the Northern Hemisphere. Boreal coniferous forests alone account for 24 percent of global tree cover, forming the largest terrestrial biome on Earth. Smaller but ecologically significant coniferous forests also grow in temperate coastal zones, on tropical mountains, and in scattered pockets of the Southern Hemisphere.
The Boreal Belt Across the Northern Hemisphere
The single largest concentration of coniferous forest on the planet is the boreal zone, sometimes called the taiga. It wraps around the globe between roughly 50°N and 70°N latitude, running through Russia, Scandinavia (Finland, Sweden, Norway), Canada, and Alaska. Russia holds the biggest share by far, with Siberian forests covering millions of square kilometers of spruce, larch, and pine. Canada’s boreal forest is the second largest, stretching from British Columbia and the Yukon east to Newfoundland.
These forests endure extreme seasonal swings, with winter temperatures plunging to -40°C and summer highs reaching around 20°C. Annual rainfall is relatively modest, typically between 300 and 900 mm. The soils underneath are often acidic and nutrient-poor, which is one reason conifers dominate here: their needle-shaped leaves and shallow root systems are well suited to cold, thin soils that would challenge most broadleaf trees.
Temperate Forests of North America and Europe
Temperate coniferous forests cover approximately 2.4 million square kilometers worldwide, and they include some of the most massive trees on Earth. In northern California, coastal redwoods reach heights above 100 meters. Farther north in the Pacific Northwest of the United States and Canada, Douglas fir forests accumulate enormous amounts of living wood, with older stands holding roughly 1,000 metric tons of biomass per hectare, plus another 500 metric tons in standing dead and fallen trees. Summer drought in this region actually favors long-lived conifers over the hardwoods that establish first.
In Europe, conifers dominate mountain forests in the Alps, Carpathians, and Scandinavian highlands. Native species like Norway spruce and Scots pine form the backbone of these forests, though European forestry has also expanded conifers into lowland areas where broadleaf trees would naturally prevail. China’s mountain ranges host their own extensive coniferous forests as well, particularly in the western and southwestern provinces.
Mountain Forests at Higher Elevations
Even outside the boreal zone, conifers claim territory by moving uphill. In the Rocky Mountains of Colorado, the montane coniferous ecosystem spans roughly 5,600 to 9,500 feet in elevation, with ponderosa pine, lodgepole pine, and Douglas fir filling these slopes. Above that, subalpine fir and Engelmann spruce take over until the trees thin out entirely at the treeline.
The same pattern repeats in mountain systems around the world. In the Himalayas, coniferous forests of blue pine, deodar cedar, and various fir species occupy mid-elevation bands, typically between about 2,000 and 3,500 meters. The Alps, Caucasus, and mountains of central Asia all have their own coniferous zones that start where conditions become too cold or too rocky for broadleaf species to compete.
Tropical and Subtropical Coniferous Forests
Coniferous forests are not strictly a cold-climate phenomenon. Mexico harbors the world’s richest and most complex subtropical coniferous forests, with dozens of pine and fir species growing across its mountain ranges. These forests extend south through Guatemala, Honduras, and El Salvador into Nicaragua. In the Caribbean, pine forests grow on several of the Greater Antilles islands, the Bahamas, and Bermuda.
Southeast Asia has its own tropical coniferous forests, though they are far smaller in extent. Pine-dominated stands appear at higher elevations in the Philippines, Vietnam, and parts of Indonesia, typically on nutrient-poor soils where pines outcompete tropical broadleaf trees.
Southern Hemisphere Pockets
The Southern Hemisphere has no equivalent of the boreal belt, but native conifers grow in surprising variety across several regions. South America’s most iconic species is the monkey puzzle tree, native to southern Chile and the adjacent slopes of the Andes. The alerce, a massive long-lived conifer sometimes compared to the redwoods, also grows in Chile. On the drier eastern side of the Andes, other native conifers fill in where rainfall drops.
Oceania is home to a particularly diverse set of coniferous species. New Caledonia, a small island group in the South Pacific, holds the largest number of species in the ancient Araucaria and Agathis genera. Australia has 14 of the 16 known species of Callitris, a cypress relative, while Tasmania supports pencil pines and celery top pines in its cool western mountains and drier eastern lowlands. Norfolk Island pine, native to a tiny island between Australia and New Zealand, is now planted ornamentally around the world. New Zealand’s wet forests contain native cedar-like conifers, and New Guinea has high-altitude coniferous species as well.
Africa has the least coniferous diversity of any forested continent. The Widdringtonia genus grows in mountainous areas of southern Africa, including parts of South Africa and Malawi, but these small populations represent a fraction of the continent’s overall forest cover.
What Determines Where Conifers Grow
The pattern across all these locations comes down to a few consistent factors. Conifers tend to dominate wherever conditions are too harsh for broadleaf trees: cold temperatures, poor or acidic soils, seasonal drought, or thin mountain soils at high elevation. Their needle-shaped leaves lose less water than broad leaves, and most species stay green year-round, letting them photosynthesize as soon as conditions allow rather than waiting to regrow leaves each spring.
Precipitation across coniferous regions varies widely, from around 300 mm per year in dry boreal and interior mountain areas to well over 2,000 mm in the rainforests of the Pacific Northwest and temperate Chile. The common thread is not a specific amount of rain but rather some limiting factor, whether cold, drought, fire, or poor soil, that gives conifers an edge over competing tree types. That adaptability is why coniferous forests appear from sea level on subarctic coastlines to mountain slopes near the equator.