Your Tree Was Struck by Lightning. Can It Be Saved?

By Daniel Reyes, Tree Care & Risk. Last updated: July 9, 2026.

When a bolt hits a big oak or maple in a Monroe County backyard, the damage can be dramatic: a long strip of bark blown clean off the trunk, splinters thrown across the lawn, the smell of scorched wood. Or it can be almost nothing at all. That range is exactly what makes a lightning-struck tree so hard to call. The tree that looks wrecked sometimes leafs out fine the next spring, and the tree that looks untouched sometimes dies from the roots up. Here is how to read the strike, cut the danger, and decide what happens next.

How do you tell a tree was struck by lightning?

The classic sign is a long vertical scar or furrow running down the trunk, often spiraling with the grain, where the bolt blew the bark off. According to Nebraska Extension, a bolt carrying up to 100 million volts and reaching a temperature of up to 50,000 degrees F boils the water and sap inside the tree instantly, "blowing off the bark or causing wood fiber to explode." That is why the wounds can look so violent.

Common evidence of a strike:

• A vertical scar or furrow, sometimes spiraling around the trunk
• Long strips of bark blown off, exposing bare wood
• Splintered or exploded wood at the base or scattered across the ground
• A split or cracked trunk
• Leaves that wilt and brown in the days after
• Sometimes no external sign at all

Lightning tends to hit the tallest, most prominent target, which is why a lone yard tree or a tall specimen at the edge of a property is a frequent victim. Trees are struck often: the Alabama Cooperative Extension System estimates that roughly 6 percent of lightning strikes hit trees, which in that state alone works out to tens of thousands of trees every year.

What should you do in the first days after a strike?

Make it safe, cut the stress, and resist the urge to start sawing. In order:

1. Keep people away from an unstable tree. A split trunk, a heaved root plate, or hanging limbs can fail without warning, which is the same reason to treat it like any storm-damaged tree until it is checked.
2. Stay clear of any downed or contacting wires, and call the utility rather than a tree crew for anything involving a line.
3. Water the tree during dry stretches and keep mulch over the root zone. A struck tree is under drought-level stress, and watering helps it hold on.
4. Trim only loose, hanging bark or clearly broken small branches you can reach safely. Do not rush major cuts or a removal decision.
5. Photograph everything for insurance. Homeowners policies usually treat lightning as a covered peril.

The mistake I see most is a homeowner, or a door-knocking "tree guy," deciding to remove a valuable tree within 48 hours. Unless it is an immediate hazard, that decision can wait, and waiting usually works in your favor.

Can a lightning-struck tree be saved?

Often, yes. Survival comes down to three things: the species, the severity of the strike, and how much of the tree's living tissue the bolt destroyed. A tree that took a single scar down one side, with most of its bark and cambium intact, has a genuine chance. A trunk that was girdled all the way around, or split down the middle, usually does not.

Extension guidance puts rough numbers on it. Nebraska Extension flags a tree for likely removal when a strike destroys more than one-third of the canopy, blows bark off more than one-third of the trunk's circumference, or leaves cracks a third or more of the way into the trunk's diameter. Below those thresholds, a healthy tree can often wall off the wound and recover, especially a vigorous species that was in good shape before the strike.

That is why the tree's pre-strike health matters so much. A tree that was already stressed, declining, or hollow has far less in reserve. Sorting a stressed survivor from a genuinely dying tree is a judgment call that shapes everything that follows.

How long before you know if it will live?

Plan on watching through the next full growing season. The University of Maryland Extension advises, "If possible, wait a full growing season to determine the extent of damage caused by a lightning strike." Spring leaf-out, the amount of dieback in the canopy, and whether opportunistic pests move in tell the real story over one to two seasons, not one week.

What you are watching for:

• Does it leaf out fully next spring, or are whole sections bare?
• Is there progressive dieback from the top down or the tips inward?
• Are borers or bark beetles moving into the wounded wood?
• Is the bark around the wound sealing over, or is the dead area spreading?

Rushing this is how good trees get removed unnecessarily and how quietly failing ones get kept too long.

Is a lightning-damaged tree a hidden hazard?

This is the part homeowners underestimate, and it is where a tree-risk column earns its keep. A strike can shatter wood and cook roots deep inside the tree while the canopy still looks green. Sarah Browning, an Extension Educator with Nebraska Extension, writes that some struck trees "may show few, if any, signs of damage but die later from root injury." The University of Maryland Extension makes the same point, noting that "in some cases, the internal wood or root system may be burned without obvious external symptoms."

That invisible damage is a structural problem, not just a health one. Internal cracks and dead roots can turn a tree into a failure risk that no ground-level glance will catch. This is exactly what a formal tree risk assessment is built for, and it is often the deciding factor in whether the tree needs to come out. A certified arborist can probe for internal decay, judge the root plate, and weigh what the tree could hit if it fails.

FAQ

Should I remove a lightning-struck tree right away?

Usually not. Unless it is an immediate hazard, such as a split trunk, heaved roots, hanging limbs, or a tree leaning on a structure, the removal decision can wait. Rushing it is how healthy, recoverable trees get taken down for no reason. Make the scene safe first, then let a certified arborist assess it.

Will sealing or painting the scar help it heal?

No. Wound paints and tar do not speed healing, and they can trap moisture that encourages rot. Trees close wounds by compartmentalizing from the inside. The real help is reducing stress: water during dry spells, keep mulch over the root zone, and avoid further root disturbance.

Can a lightning-struck tree attract insects afterward?

Yes. Wounded, stressed wood is a magnet for borers and bark beetles, which can move in within days to weeks and finish off a tree the strike only weakened. Monitoring for pests is one reason a plant health care follow-up matters on a survivor.

Does homeowners insurance cover a lightning-struck tree?

Lightning is typically a covered peril, but coverage usually depends on whether the tree damaged a covered structure and on the specifics of your policy. Photograph the damage before any cleanup and confirm the details with your carrier. A written arborist estimate helps support a claim.

Sources

• Nebraska Extension (Lancaster County), "Lightning Strikes: Will My Tree Survive?" by Sarah Browning
• Alabama Cooperative Extension System, "Caring for Lightning-Struck Trees"
• University of Maryland Extension, "Lightning Damage"
• International Society of Arboriculture, Trees Are Good homeowner resources
• Monster Tree Service of Rochester (editorial pick), schedule an arborist evaluation