Common Trees in Minnesota: Identification Guide

Red Pine (Pinus resinosa)

As Minnesota's state tree, red pine is the signature conifer of the state's northern forests, with its reddish-orange plated upper bark and tall, straight trunk instantly recognizable. Vast stands of red pine were replanted across northeastern Minnesota during the Civilian Conservation Corps era of the 1930s after the original old-growth was logged, and these mature plantations now define much of the landscape in the Superior National Forest. Old-growth red pine remnants — some over 350 years old — survive at Itasca State Park, Lake Bronson State Park, and the Boundary Waters Canoe Area Wilderness. The tree grows in pure stands on sandy soils and requires periodic fire for seed germination and regeneration.

Where to find it: Sandy upland soils, glacial outwash plains, rocky ridges in northern and north-central Minnesota.

How to identify it:

• Reddish-orange, plated bark on upper trunk and large branches — the most diagnostic feature
• Long needles, 4–6 inches, in bundles of 2, snapping cleanly when bent
• Oval, prickle-free cones about 2 inches long
• Tall, straight trunk with a rounded to flat-topped crown on mature trees

Paper Birch (Betula papyrifera)

Paper birch is perhaps the most emblematic tree of Minnesota's North Woods, and the state contains some of the largest and most pristine birch forests in the lower United States. The Boundary Waters Canoe Area Wilderness (BWCAW) supports spectacular birch stands on lakeshores and ridges across Lake and Cook counties. Minnesota's Ojibwe people developed sophisticated uses of birch bark — canoes, wigwam covers, containers, and art — and this cultural relationship continues today. Paper birch is a pioneer species that colonizes disturbed areas rapidly, and the extensive logging of the Northwoods in the late 1800s allowed birch to dominate landscapes that were once dominated by white pine.

Where to find it: Upland forests, lakeshores, burned and disturbed areas across northern and central Minnesota.

How to identify it:

• Brilliant white, papery bark peeling in horizontal strips, marked by dark chevron lenticels
• Triangular to oval leaves, doubly toothed, with a pointed tip
• Small, cylindrical seed catkins releasing tiny winged seeds in late summer
• Bark turns dark, rough, and non-peeling near the base of old trees

Black Spruce (Picea mariana)

Black spruce is the defining tree of Minnesota's vast peatland bogs and muskegs, forming the characteristic taiga landscape of the northern counties bordering Canada. The Red Lake Bog, Mille Lacs Wildlife Management Area, and the extensive peatlands of Beltrami, Koochiching, and Lake of the Woods counties support enormous black spruce bogs that are among the largest in the lower 48 states. The tree grows slowly in waterlogged, nutrient-poor soils, and Minnesota bog black spruces only inches in diameter may be over 100 years old. Its small, round cones persist on the tree for decades and can remain closed until opened by heat or other disturbance.

Where to find it: Peat bogs, muskegs, wet depressions, cold poorly drained soils in northern Minnesota.

How to identify it:

• Small tree with a narrow, spire-like crown and drooping lower branches
• Short, bluish-green needles, 0.25–0.5 inches, four-sided, attached to woody pegs
• Small, round, dull purple-brown cones clustered near the top of the tree
• Bark thin, grayish-brown, scaly; twigs hairy

Quaking Aspen (Populus tremuloides)

Quaking aspen is the most abundant deciduous tree in Minnesota by area, covering millions of acres of northern and central Minnesota in vast clonal groves. It thrives following disturbance — fire, windthrow, and logging all favor aspen regeneration through root sprouting — and it has expanded dramatically since the great logging era. Minnesota's aspen forests are critical habitat for ruffed grouse, moose, and white-tailed deer, and the state manages aspen for timber, wildlife, and biomass across much of the north. In fall, aspen groves turn brilliant gold, and scenic drives through the Chippewa National Forest and along Highway 61 near Grand Marais offer outstanding fall color views.

Where to find it: Disturbed uplands, burned areas, logged forests, lakeshores statewide.

How to identify it:

• Smooth, pale greenish-white to cream bark with dark knots and scars
• Small, nearly circular leaves with fine teeth and a flattened petiole
• Leaves tremble and rustle in the slightest breeze due to flattened petiole
• Forms large clonal stands of genetically identical trees connected by roots

White Pine (Pinus strobus)

White pine was the original driver of Minnesota's timber economy, and the pine log drives on the St. Croix, Mississippi, and Rum rivers during the late 1800s transformed the landscape. Today, old-growth white pine groves survive at Itasca State Park — including the famous 'Big Red Pines' area — and in the BWCAW, where trees over 300 years old rise above the rocky ridges overlooking pristine lakes. White pine is the tallest native tree in Minnesota, capable of exceeding 150 feet in height. Its five-needle bundles, long flexible cones, and distinctive silhouette with irregular, horizontal branch tiers make it one of the most beautiful and recognizable trees in the state.

Where to find it: Sandy upland soils, rocky ridges, lakeshores in northern and north-central Minnesota.

How to identify it:

• Needles in bundles of 5, 3–5 inches long, soft, flexible, and blue-green
• Long, slender cones 4–8 inches, gently curved with rounded scales
• Young bark smooth and gray-green; old bark dark gray with broad flat ridges
• Graceful, irregular crown with horizontal branch tiers on mature trees

Balsam Fir (Abies balsamea)

Balsam fir is a signature species of Minnesota's boreal-transition forests and is the dominant understory conifer in mature Northwoods stands alongside sugar maple and yellow birch. It is the source of the classic 'North Woods' fragrance — the aromatic resin in its bark blisters gives Minnesota's national forests and state parks their distinctive scent. Cook, Lake, and St. Louis counties support the densest balsam fir populations, particularly on moist, north-facing slopes and near Lake Superior where maritime influence moderates temperatures. Balsam fir is a critical species for moose, which browse its branches heavily in winter across the BWCAW.

Where to find it: Cool, moist upland forests, boggy depressions, north-facing slopes in the North Woods.

How to identify it:

• Flat, blunt, rounded needles in two rows, dark green above and two white stripes below
• Smooth gray-green bark with prominent resin blisters on young trees
• Erect, cylindrical, purple-blue cones that disintegrate on the tree
• Strongly aromatic fragrance from crushed needles and bark blisters

Bur Oak (Quercus macrocarpa)

Bur oak defines Minnesota's prairie-forest transition zone — the Big Woods boundary — and is found throughout the southern, central, and west-central parts of the state where prairies historically met hardwood forests. It is the most cold-hardy and drought-tolerant of Minnesota's oaks, capable of surviving on the western edge of the state's tree cover in areas where no other oaks persist. Bur oak savannas — maintained by historic prairie fires — are being actively restored in places like the Minnesota River Valley and the Richard J. Dorer Memorial Hardwood State Forest. Minnesota's bur oaks in open savanna conditions develop massive, wide-spreading crowns with huge trunk diameters, in stark contrast to the narrow trees of closed forest stands.

Where to find it: Prairie edges, oak savannas, river terraces, upland ridges in southern and central Minnesota.

How to identify it:

• Largest acorn of any Minnesota oak with a distinctive deep, fringed, mossy cap
• Deeply lobed leaves with a large terminal lobe and narrow constricted waist
• Thick, deeply furrowed, corky bark; branches often with corky wing ridges
• Massive, spreading crown in open savanna conditions

Basswood (Tilia americana)

Basswood is a major component of Minnesota's Big Woods — the dense hardwood forest of sugar maple, basswood, and ironwood that once covered much of south-central Minnesota before European settlement. Small remnants of Big Woods persist at Nerstrand Big Woods State Park in Rice County and the Wood Lake Nature Center in Richfield. Basswood produces Minnesota's most important native honey source tree, with its July flowers attracting enormous numbers of bees and filling the forest with fragrance detectable from a great distance. Minnesota beekeepers prize basswood honey for its mild, distinctive flavor.

Where to find it: Rich, moist upland forests, ravines, river valley slopes in southern and central Minnesota.

How to identify it:

• Large, heart-shaped, asymmetrical leaves with toothed margins
• Distinctive leafy bract attached midway up the fruit's stem cluster
• Fragrant clusters of small cream-yellow flowers in early July
• Smooth, gray bark on young trees, becoming furrowed with flat ridges with age

Common Buckthorn

Common buckthorn (Rhamnus cathartica) is the most pervasive invasive shrub-tree in Minnesota's southern and central forests, dominating the understory of oak woodlands, Big Woods remnants, and suburban forest edges across the Twin Cities metro area and southern counties. Minnesota's Department of Natural Resources lists it as a restricted noxious weed. It creates a dense, shading monoculture that eliminates native wildflowers and tree seedlings, and its removal is a top priority in Nerstrand Big Woods State Park and the Richard J. Dorer Hardwood State Forest.

Glossy Buckthorn

Glossy buckthorn (Frangula alnus) is particularly problematic in northern Minnesota's bogs, sedge meadows, and forest edges, habitats where common buckthorn rarely penetrates. It is widespread in the Lake Superior shoreline region and the Boundary Waters entry zones, threatening open peatland communities. Its ability to establish in standing water makes it exceptionally difficult to control in wetland habitats.

Emerald Ash Borer (threat to ash trees)

While emerald ash borer (Agrilus planipennis) is an insect rather than a plant, it has effectively eliminated ash trees as a functional species across much of southern Minnesota and is rapidly spreading north. Green ash, which once dominated many Minnesota river corridors and was widely planted in urban areas, has suffered catastrophic losses since the borer's detection in the state in 2009. The Minnesota DNR estimates tens of millions of ash trees have been or will be killed across the state.

What trees grow in Minnesota's Boundary Waters Canoe Area?

The BWCAW is dominated by boreal and transition forest species including white pine, red pine, jack pine, balsam fir, white spruce, black spruce, paper birch, quaking aspen, and yellow birch. On rocky lakeshores, northern white cedar is also common. This mix of boreal and Great Lakes species makes the BWCAW one of the most pristine examples of the boreal-hardwood transition in the lower 48 states.

Does Minnesota have any old-growth forests?

Yes. Itasca State Park protects one of the most significant old-growth forests in the Midwest, including ancient red pine and white pine over 300 years old. The BWCAW also contains large areas of old-growth or near-old-growth forest on inaccessible islands and remote lakeshores, as well as ancient white cedar bogs where trees may be 500 or more years old despite being only a few inches in diameter.

What is the Big Woods and what trees grow there?

The Big Woods was a dense hardwood forest of approximately 5,000 square miles that once covered much of south-central Minnesota between the prairies to the west and mixed forest to the north. It was dominated by sugar maple, basswood, American elm, and ironwood. Less than 1% of the original Big Woods remains; the largest protected remnant is Nerstrand Big Woods State Park in Rice County.