Do Squirrels Destroy Trees? Bark Stripping Is the Real Risk

Twig cutting is cosmetic; a ring of stripped bark kills everything above it. Which trees suffer, when it happens, and what protects a young one.

By Salma November 2, 2026 3 min read Save to Pinterest

A broken-open cavity in a tree trunk, bark stripped around the wound — Photo: 10512837, Pixabay Content License, via Pixabay

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Mostly no — with one real exception. Bark stripping all the way round a trunk kills everything above it, and young smooth-barked trees are the ones that die.

The three things squirrels do to trees

behaviour	harm
Cutting green twigs	none on an established tree — it is nest material
Taking nuts, buds and fruit	a crop loss to you, not damage to the tree
Nesting in the canopy	none
Stripping bark	this is the one. Girdling kills

Why they strip bark

Two reasons, both seasonal:

The phloem. The sugary layer just under the bark is a food source in late spring and early summer, exactly when cached nuts have run out and the new nut crop is months away
Nest lining. Shredded bark is the soft inner layer of a drey

Population density drives it hard. A garden supporting an artificially high number of squirrels — usually because of a bird feeder — produces far more bark damage than one that does not.

Which trees

high risk	low risk
Beech	mature rough-barked oak
Sycamore and maple	conifers, mostly
Young oak	birch
Hornbeam	old thick-barked trees generally
Ash
Young fruit trees

The sweet spot for damage is a tree roughly ten to forty years old: the bark is still thin enough to strip, and the tree is big enough to be worth climbing.

Check whether the strip goes all the way round

This is the whole prognosis. Any intact vertical strip of bark means the tree can still move sugars past the wound and will usually callus over. A complete ring means everything above it is dead, whatever you do. There is no treatment for girdling — no wrap, paint or sealant restores it.

Telling squirrel damage from other causes

	squirrel	deer	rabbit / vole
Height	anywhere, often high in the canopy	up to about 5 ft	ground level to 2 ft
Pattern	irregular patches, strips pulled upward	vertical scrapes from antlers, or torn	neat gnaw marks, often under snow line
Edges	ragged, tooth marks visible	torn, frayed	clean parallel incisor marks
Season	late spring, early summer	autumn rut, winter	winter

Rabbit and vole damage sits at the base and shows neat parallel incisor marks. Squirrel damage is higher, patchier and messier.

Protecting a tree

For a young or specimen tree:

A smooth metal band around the trunk — about 2 ft wide, lower edge at least 6 ft up. It only works if nothing gives lateral access, and squirrels jump 6 to 8 ft, so prune away bridges from neighbouring trees, fences and roofs
A mesh cylinder held clear of the bark on small trunks — this also stops rabbit and vole damage at the base
Both, on anything you would be sorry to lose

For the garden generally:

Move bird feeders 15–20 ft from the trees you care about, and sweep the spill. Reducing how many squirrels the garden supports does more than anything applied to the tree
Switch to hulled or pepper-treated seed

What does not work: trunk sprays, ultrasonic devices, mothballs, and greasing the trunk — which also damages the bark and traps birds and insects.

On a mature tree

Usually nothing needs doing. A large oak or beech loses a few patches of bark and a trivial fraction of its canopy, and will outlive the argument.

The case for intervening is a young tree, a specimen you planted, or an orchard where ring-barking would cost you the tree outright.

Common questions

Do squirrels kill trees?

They can, through bark stripping rather than through anything else they do. A strip of bark removed all the way round a trunk or branch severs the phloem and everything above that point dies. On a mature oak a patch of stripped bark is survivable; on a four-year-old maple a complete ring is fatal. Twig cutting, nut taking and nesting do no lasting harm.

Why do squirrels strip bark?

For the sugary phloem just beneath it, and for nest lining. It peaks in late spring and early summer, when cached nuts are exhausted and sap is rising, and shredded bark is the soft inner layer of a drey. Grey squirrels in particular do it, and high local population density makes it much worse — which is partly a bird feeder problem.

Which trees do squirrels damage most?

Smooth, thin-barked species with sap close to the surface: beech, sycamore, maple, young oak, hornbeam and ash. Trees roughly ten to forty years old suffer most, because the bark is thin enough to strip and the tree is large enough to be worth climbing. Rough-barked mature trees and conifers are largely left alone.

Can a tree recover from bark stripping?

It depends entirely on whether the damage goes all the way round. A partial strip usually heals over with callus tissue and the tree carries on, though the wound is an entry point for decay. A complete ring — girdling — kills everything above it, and there is no treatment. Checking whether any strip of intact bark remains is the first thing to assess.

How do I protect a young tree from squirrels?

A smooth metal band around the trunk, about 2 feet wide with its lower edge at least 6 feet above ground, stops climbing — but only if no branch, fence or neighbouring tree gives lateral access, because squirrels jump six to eight feet. For small trees a mesh cylinder held clear of the bark works. Reducing the local population by moving bird feeders away helps more than any spray.

Is twig cutting a problem?

No. The fresh green twigs on your lawn are drey material — green wood bends into a nest where dry wood snaps, so a nesting squirrel cuts dozens of small branches. On an established tree the canopy loss is trivial. It looks alarming and it is the single most-reported squirrel tree behaviour, and it is not the one that matters.

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A red squirrel at the base of a tree carrying a cut twig in its mouth

Backyard Animals · Nov 1, 2026