When a tree should come down
A tree needs to be removed when it poses a safety risk, is dead or dying, or is causing structural damage to your home or property. The most common reasons are a cracked or leaning trunk, large dead branches overhead, disease that has spread through most of the canopy, or roots that are lifting your foundation or breaking your driveway. If a tree has already failed in a storm—snapped partway up the trunk or uprooted—removal is usually the only option.
Not every problem tree needs to come down when ready. A tree with one dead limb, minor pest damage, or a small lean may recover or be saved with pruning. But if the damage is extensive, the tree is in a location where failure would hit your house or a neighbor's, or a certified arborist tells you the tree is structurally unsound, removal is the safer choice.
Key Takeaways
- A tree with a split or cracked trunk, severe lean, or large dead branches overhead is unsafe and should be removed.
- Dead trees and trees infested with wood-boring insects throughout the trunk lose structural strength and can fail without warning.
- Roots that are lifting concrete, breaking pipes, or damaging your foundation are a sign the tree is too large for its location.
- A certified arborist can inspect a tree and tell you whether it can be pruned to safety or must be removed.
- Storm damage that splits the trunk or uproots the tree usually means removal is the only practical option.
Visible trunk damage and structural problems
Look at the main trunk from the ground up. A vertical crack or split running along the length of the trunk is a sign the tree is failing. The wood is separating, and the tree cannot heal a crack this large. Even if the tree is still leafing out, the structural damage is permanent.
A severe lean—where the trunk tilts noticeably away from vertical—is another red flag. A slight lean is normal for many trees, but if the tree is leaning more than 15 degrees from vertical, or if the lean got worse after a storm, the root system may be compromised. The tree could fall without much additional wind.
Check the base of the trunk where it meets the ground. If you see a hollow cavity, large wound, or missing bark that exposes the wood underneath, the tree has lost structural integrity. Cavities that go deep into the trunk mean the tree cannot support its own weight safely.
Dead branches and canopy loss
Walk around the tree and look up into the canopy. Dead branches are straightforward to spot: they have no leaves in summer, no buds in spring, and the bark is gray or peeling. A few dead branches at the top are normal, but if more than 25 percent of the canopy is dead, or if large dead branches hang over your house, the tree is declining fast.
Dead branches fall without warning, especially in wind or ice storms. A branch the size of your arm falling from 40 feet can punch through a roof or hit a car. If you have dead branches over a structure you use—your house, a deck, a parked car, or a child's play area—those branches need to come down. If removing them would leave the tree severely unbalanced or if the tree is mostly dead anyway, removal is the next step.
Look at the overall shape of the canopy. If the tree is one-sided—with most of the leaves and branches on one side and bare wood on the other—it is struggling. This happens when disease, pest damage, or root problems affect one side of the tree. A one-sided tree is also more likely to fall in wind because the weight is unbalanced.
Disease, pest damage, and bark problems
Inspect the bark for signs of wood-boring insects. Look for small holes (the size of a pencil point or smaller) scattered across the trunk and large branches, or for sawdust-like material (called frass) on the bark or ground below. Insects like emerald ash borers, bark beetles, and longhorn beetles tunnel through the wood and weaken the tree from the inside. Once you see exit holes, the damage is already extensive.
Some diseases show up as cankers—sunken, discolored patches on the bark where the tree is dying back. If cankers are girdling the trunk (wrapping all the way around), the tree cannot move water and nutrients past that point, and everything above will die. Fungal diseases like anthracnose or Dutch elm disease also cause branch dieback and canopy thinning.
Mushrooms or shelf fungi growing on the trunk or at the base are a sign of internal rot. These fungi break down the wood from inside, and a tree with significant rot is hollow and weak. A certified arborist can use a tool called a resistograph to measure how much solid wood is left in the trunk.
Root problems and foundation damage
Walk around the base of the tree and look at the ground. Raised or buckled concrete in your driveway, sidewalk, or patio is a sign the roots are pushing upward as they grow. Roots that large are also likely to be breaking water pipes, sewer lines, or the foundation itself.
If you have noticed cracks in your foundation, wet spots in your basement, or slow drains, and a large tree is growing nearby, the roots may be the cause. Roots seek water and can grow toward pipes and cracks. Once roots enter a pipe, they block it and cause backups.
Some trees are straightforward too large for their location. A mature oak or maple can have roots spreading 40 feet or more from the trunk. If the tree is close to your house, driveway, or septic system, removal may be the only way to prevent ongoing damage. A smaller tree or a species with less aggressive roots can be planted in its place.
Storm damage and failure
If a tree has snapped partway up the trunk or uprooted in a storm, removal is almost always necessary. A tree that has split or lost its root anchor cannot be saved. Even if part of the trunk is still standing, the tree is unsafe and will not recover.
After a storm, also check for torn bark and exposed wood where branches broke off. Large wounds like this do not heal well and invite disease and insect damage. If the tree lost many large branches, it may be too damaged to save, depending on how much canopy remains.
A tree that failed once is at high risk of failing again. If a tree fell or dropped a large branch, have it inspected by a certified arborist. Even if it is still standing, the structural damage may be severe enough that removal is the safer choice.
When to call a certified arborist
If you are unsure whether a tree should stay or go, hire a certified arborist to inspect it. Arborists are trained to spot problems you cannot see from the ground and can tell you whether the tree can be saved with pruning or treatment, or whether removal is necessary. They can also assess the risk: a tree with disease may be safe for another five years if it is far from structures, but dangerous if it hangs over your house.
An arborist inspection usually costs between $100 and $300 and takes about an hour. The arborist will look at the trunk, canopy, roots, and location, and give you a written report. If removal is recommended, you can use that report to get quotes from tree removal companies.
Do not rely on a tree removal company's inspection alone to decide whether a tree should come down. Removal companies have a financial incentive to recommend removal. An independent arborist has no stake in the outcome and can give you an honest assessment.
Frequently Asked Questions
Can a leaning tree be saved, or does it always need to be removed?
A slight lean is usually not a problem, but a severe lean (more than 15 degrees) or a lean that got worse after a storm suggests root damage. A certified arborist can tell you whether the roots are still anchoring the tree safely. If the lean is recent and the tree is otherwise healthy, it may recover. If the lean is getting worse, removal is safer.
What if only one side of the tree is dead?
A one-sided dead tree is declining and will likely continue to lose branches. Pruning off the dead side can help temporarily, but the tree is stressed and may not recover. If it is in a location where falling branches could cause damage, removal is the better choice. An arborist can assess whether the tree will stabilize or continue to decline.
Is a tree with holes in the bark always infested?
Small holes in the bark can mean wood-boring insects are active inside. However, some holes are old exit holes from insects that are no longer there. Look for fresh sawdust or oozing sap around the holes, which means the infestation is current. If you see many fresh holes across the trunk, the tree is likely heavily infested and should be removed.
How long can a dead tree stand before it falls?
A completely dead tree can stand for months or years depending on the species and weather, but it becomes weaker over time. Dead wood is brittle and breaks easily in wind or under the weight of ice or snow. A dead tree over your house or a neighbor's property should be removed as soon as possible rather than waiting for it to fail.
What should I do if a tree is leaning toward my house after a storm?
Do not wait. A tree leaning toward your house after a storm has likely lost root anchorage and could fall. Keep people and vehicles away from the area and contact a tree removal company or certified arborist right away. If the tree is large or close to the house, this is a safety emergency.