The simplest rule for spacing maples is to plant them as far apart as one tree will eventually be wide. Two sugar maples that each spread 40 to 50 feet need that much room between trunks if you want each to keep a full, rounded crown. Plant them closer and the crowns merge into one canopy, which can work for a screen but not for specimen trees.

Table of Contents

The short answer: space maples by their mature width. Sugar maple: about 40 to 50 feet apart. Red maple: about 35 to 45 feet. Silver maple: 30 to 50 feet (all widths from The Morton Arboretum). Trident maple: 20 to 30 feet (NC State Extension). Japanese maple: 10 to 25 feet, depending on the cultivar. For a row whose crowns will meet, you can plant at roughly two-thirds of the mature width.

Maple spacing chart

Maple	Mature height	Mature width	Trunk-to-trunk spacing
Sugar maple (Acer saccharum)	60 to 75 ft	40 to 50 ft	40 to 50 ft
Red maple (A. rubrum)	40 to 60 ft	35 to 45 ft	35 to 45 ft
Silver maple (A. saccharinum)	50 to 70 ft	30 to 50 ft	30 to 50 ft
Amur maple (A. ginnala)	15 to 18 ft	15 to 18 ft	15 to 18 ft
Trident maple (A. buergerianum)	25 to 35 ft	20 to 30 ft	20 to 30 ft
Japanese maple (A. palmatum)	Up to about 25 ft	10 to 25 ft	10 to 25 ft

Sizes for sugar, red, silver and Amur maple are from The Morton Arboretum’s tree profiles. Trident and Japanese maple sizes are from the NC State Extension Gardener Plant Toolbox. Cultivars vary, so check the label on the tree you buy, especially for Japanese maples. Dwarf types stay far smaller than upright selections, which can approach 25 feet.

Why mature width is the number that matters

Young trees look tiny next to the gaps you leave, which tempts people to plant them closer. Within 15 to 20 years, though, a red or sugar maple’s branches will reach their full spread. Crowded maples compete for light, so the lower and inner branches thin out. They also grow lopsided toward open sky and are harder to prune well. Roots compete for water too, which matters for sugar maple because it does not handle drought or compacted soil well.

Spacing for different goals

Specimen or shade trees

Use the full mature width. This gives each tree a balanced crown and leaves room for mowing and light under the canopy.

A row or allée along a drive

For a continuous canopy, many designers plant at about two-thirds to three-quarters of the mature width. For red maples that works out to roughly 25 to 35 feet. The crowns will touch and interlock, which is the look you want along a drive.

Screens and small groups

Smaller maples such as Amur maple can be planted at about half their mature width, around 8 to 10 feet, to form a dense, informal screen. Expect to remove a tree later if they crowd too much.

Japanese maples in borders

Give a Japanese maple at least its mature width away from other trees and large shrubs. Its graceful shape is the point, and squeezed trees lose it. Our guide to how big Japanese maples grow lists sizes by type.

Spacing from houses, drives and lines

Distance from buildings is a separate question from spacing between trees. As a rule of thumb, keep a large maple at least half its mature width from a wall so branches clear the roof. That is roughly 20 to 25 feet for a sugar maple. Our guide on how far from a house to plant a maple covers this in detail. Our Tree Planting Distance Calculator gives suggested distances from houses, other trees and fences for common maples.

Before you dig, call 811 or your local utility locator. Keep tall maples out from under overhead power lines.

Common spacing mistakes

Spacing by the nursery size. A 6-foot whip will be 40 feet wide one day. Always plan for the mature width on the label or in the chart above.
Forgetting the neighbors. Measure to your own trees and also to the property line, the neighbor’s trees and any shed or fence a crown would hang over.
Mixing large and small maples too closely. A Japanese maple planted under a young sugar maple will be in deep shade within a decade. Give the small tree its own space outside the big tree’s future canopy.
Planting a “temporary” filler. Fillers are rarely removed in time. If you plant one, mark it and take it out as soon as the permanent trees start to touch.

Planting tips once you have the spacing

Mark each planting spot with a stake and step back to check it from the house and street.
Dig a hole two to three times as wide as the root ball and no deeper. The International Society of Arboriculture advises keeping the trunk flare partly visible.
Plant in the dormant season, in fall after leaf drop or in early spring before bud break, when ISA says conditions are ideal.
Mulch a wide ring around each tree, but keep mulch off the trunk.

For a full walkthrough, see our maple planting guide.

Sources

Sugar Maple, The Morton Arboretum
Red Maple, The Morton Arboretum
Silver Maple, The Morton Arboretum
Amur Maple, The Morton Arboretum
Acer palmatum (Japanese Maple), NC State Extension Gardener Plant Toolbox
Acer buergerianum (Trident Maple), NC State Extension Gardener Plant Toolbox
Planting a Tree, International Society of Arboriculture, TreesAreGood.org

Top photo: NPS, Public domain, via Wikimedia Commons

Maple Tree Spacing: How Far Apart to Plant