Oaks are some of the best trees you can plant: long-lived, strong and great for wildlife. They are also some of the biggest. A small oak sapling planted 10 feet from the house will, in a few decades, be pushing branches into the roof. The right distance depends on the species, but the short answer is farther than you think.
The short answer: plant large oaks such as white, bur and red oak at least 30 to 50 feet from a house, and medium oaks such as pin oak at least 25 to 30 feet. A good rule is at least half the mature crown width, plus extra space for the roof and roots. Keep oaks away from sewer lines, septic fields and power lines, and leave the root zone unpaved where you can.
Recommended distances by oak
| Oak | Mature height | Mature width | Suggested distance from house |
|---|---|---|---|
| White oak | 50 to 80 ft | up to 100 ft | 50 ft or more |
| Bur oak | 70 to 80 ft | 70 to 80 ft | 40 to 50 ft |
| Pin oak | 60 to 70 ft | 40 to 50 ft | 25 to 30 ft |
| Columnar oak cultivars | 40 to 50 ft | 10 to 15 ft | 15 to 20 ft |
Mature sizes for white, bur and pin oak are from the Morton Arboretum. Columnar cultivars (such as columnar English oak) vary; check the plant label. Distances are rules of thumb measured from the trunk to the nearest wall.
Why half the mature width?
A crown grows out roughly equally on each side of the trunk. A bur oak 80 feet wide reaches about 40 feet from its trunk. Planting it 40 feet away puts the branch tips near the wall, so adding extra room keeps limbs off the roof, out of the gutters and clear of the siding.
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Roots and foundations
Oak roots spread wide and shallow; the International Society of Arboriculture notes most tree roots grow in the top 12 inches of soil. Oak roots are not considered invasive the way willow or silver maple roots are, and they rarely damage sound foundations. In shrink-swell clay soils, a big tree close to a shallow foundation can contribute to settling during droughts. Keeping a good distance avoids most of these problems. Read more in are oak tree roots invasive.
Protect the oak, too
The Morton Arboretum notes white oak roots are sensitive to soil disturbance such as compaction and construction. An oak planted too close to the house will be in the way of every future project: additions, patios, driveway repairs and utility work. Planting farther away protects the tree from you as much as the house from the tree.
Look up and look down
Before planting, the ISA recommends checking:
- Overhead lines. Never plant a large oak under or near power lines.
- Underground utilities. Call 811 a few days before you dig.
- Sewer and septic. Keep well away from sewer laterals and septic drain fields.
- Neighbors. Consider where the crown and shade will fall when the tree is mature.
Light, soil and species choice
- White oak does not tolerate wet conditions and is best in well-drained sites, according to the Morton Arboretum. It is difficult to transplant because of its taproot, so plant it young.
- Bur oak is tough and adaptable, with a broad, spreading crown that needs lots of room.
- Pin oak suffers from chlorosis (yellow leaves) in alkaline soils, the Morton Arboretum warns. Test your soil before choosing it.
If you have a small lot, consider a columnar oak cultivar or a smaller tree species instead of a full-sized oak.
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Planting at the right time and protecting from oak wilt
The ISA recommends planting in the dormant seasons, fall after leaf drop or early spring before bud break. Once your oak is in the ground, remember that oaks should be pruned only in winter to reduce oak wilt risk. Iowa State University Extension recommends pruning between December and February.
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Oaks and solar panels, gardens and lawns
Think about shade, too. A mature oak on the south side of a house will cool it in summer but can shade rooftop solar panels and vegetable gardens. Lawn grass also struggles in the dense shade and dry soil under a big oak. Planting the tree to the east or west of the house, or at the edge of the yard, often gives the best balance.
Already too close?
If a young oak is too close to the house, moving it while it is still small and dormant is realistic. For established oaks, plan regular structural pruning in winter to keep branches clear of the roof, and consult a certified arborist before any construction near the roots. The ISA Find an Arborist directory can help.
Growing your own oak? See how to grow oak trees from acorns.
Sources
- White Oak, The Morton Arboretum
- Bur Oak, The Morton Arboretum
- Pin Oak, The Morton Arboretum
- Planting a Tree, International Society of Arboriculture, TreesAreGood.org
- Pruning Oak Trees to Avoid Oak Wilt, Iowa State University Extension
Top photo: Mudangel, CC BY-SA 3.0, via Wikimedia Commons