Red Maple

About Red Maple (Acer rubrum)

Red maple is one of the most widespread and recognizable trees in eastern North America. A familiar feature of forests, wetlands, parks, and neighborhoods throughout New England, it is valued for its adaptability and seasonal displays. The species can grow in a wide variety of soil conditions, from moist wetlands to relatively dry upland sites, although it generally prefers acidic soils with adequate moisture.

The tree’s common name reflects a remarkable characteristic: nearly every part of the tree can display red coloration at some point during the year. Red flower buds emerge in early spring, flowers add color before leaves appear, twigs often have a reddish tinge, and autumn foliage can turn a shade of scarlet and crimson.

Red maple plays an important ecological role throughout its range. Its early spring flowers provide nectar and pollen for bees and other pollinators when few other trees are blooming. Young trees are browsed by deer, while birds and small mammals feed on the seeds. Fallen leaves decompose relatively quickly, helping cycle nutrients back into the soil.

One of the species’ most fascinating traits is its flexibility in reproduction. Individual trees may produce male flowers, female flowers, or both. Some trees have been observed changing flower expression between years. This adaptability may help the species succeed across a wide range of environments.

Red maple has also held cultural significance for centuries. Although sugar maple is the preferred species for syrup production, red maple sap can also be collected and boiled into syrup. Indigenous peoples used various parts of the tree medicinally, including preparations made from the bark and inner bark. The genus name Acer comes from the Latin word for “sharp,” a reference to the pointed lobes of maple leaves.

Identification

Red maple is a medium to large deciduous tree with a rounded crown and a straight trunk. Young trees have smooth, light-gray bark, while mature trees develop darker bark with long, scaly ridges and plates.

The leaves are the most recognizable feature. They are arranged opposite one another on the branch and typically have three to five pointed lobes. The margins are finely serrated, and the spaces between lobes form distinct V-shaped sinuses. The undersides of the leaves are often paler than the upper surfaces.

Red maple is frequently confused with sugar maple. However, sugar maple leaves generally have smoother margins and broader U-shaped sinuses, while red maple leaves have more serrated edges and sharper V-shaped indentations. Red maple leaves typically consist of three to five fewer concave lobes while sugar maple leaves usually have five distinct, deeper lobes.

In early spring, clusters of small red flowers appear before the leaves emerge. Shortly afterward, paired winged fruits called samaras develop and mature by late spring or early summer. In autumn, the tree is often unmistakable thanks to its vivid red foliage.

Phenology Highlights

Phenology is the study of recurring seasonal events in plants and animals. The following phenophases, distinct and observable stages in the annual life cycle of a plant or animal, are monitored as part of the National Parks of Boston Tree Monitoring Program.

Breaking Leaf Buds

Red maple is often one of the first deciduous trees to show signs of spring. Lead buds swell and open shortly after flowering, revealing young leaves that may appear reddish or bronze before turning green.

Leaves & Early Season Leaf Expansion

Mature leaves of the Red Maple. NPS Photo/ W. Kaselow

Red maple leaves expand quickly during spring, forming a dense canopy of bright green foliage. Leaves are opposite, simple, and typically have three to five lobes with finely serrated edges. The V-shaped sinuses between lobes are a useful feature for distinguishing red maple from sugar maple.

Colored Leaves & Falling Leaves

Red maple is renowned for its fall foliage. Leaves may turn bright red, scarlet, orange, or yellow, sometimes displaying multiple colors on a single tree.

Flowers or Flower Buds & Open Flowers with Pollen Release

Red maple flowers very early in spring, often before leaves emerge. Small clusters of red flowers appear along the twigs and can create a reddish haze across the canopy when viewed from a distance. Depending on the individual tree, flowers may be male, female, or both.

Pollen release occurs shortly after flowers open. Male flowers produce abundant pollen that is carried by wind and insects to female flowers. Because flowering occurs before leaf-out, the flowers are especially visible and accessible to early-season pollinators.

Fruits

Fruit of the Red Maple. NPS Photo/ M. Jones

Following pollination, paired wing fruits called samaras develop rapidly. The samaras are initially green to reddish and hang in clusters throughout the canopy.

Ripe Fruits & Recent Fruit or Seed Drop

Famartin, CC BY-SA 4.0. https://creativecommons.org/licenses/by-sa/4.0/deed.en

Red maple samaras mature earlier than those of many other maple species, often in late spring to early summer. As they ripen, the fruits become tan to brown and dry, preparing for wind dispersal.

Once mature, the paired samaras spin through the air like small helicopters, allowing seeds to disperse away from the parent tree. Look for recently fallen samaras beneath the canopy.

Learn More

• Acer rubrum (red maple): Go Botany. (n.d.). Native Plant Trust. Retrieved September 4, 2026.
• Acer rubrum - Plant Finder. (n.d.). Missouri Botanical Garden. Retrieved September 4, 2026.
• Acer rubrum (Carolina Maple, Curled Maple, Drummond’s Maple, Red Maple, Scarlet Maple, Soft Maple, Swamp Maple) | North Carolina Extension Gardener Plant Toolbox. (n.d.). North Carolina State Extension Gardener Plant Toolbox. Retrieved September 4, 2026.
• Red Maple: Identification, Leaves, Bark & Habitat | Acer rubrum. (n.d.). Edible Wild Food. Retrieved September 4, 2026.

National Parks of Boston Tree Monitoring Program

By observing seasonal changes in trees, volunteers help scientists better understand how plants respond to changing environmental conditions over time.

Where this belongs

• Boston Harbor Islands National Recreation Area
• Boston National Historical Park

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