A dead or seriously declining tree shows a clear set of warning signs: no leaf-out in spring, bark peeling or slipping from the trunk, brittle branches snapping without green tissue inside, fungal growth at the base, and a hollow or soft sound when the trunk is tapped. Spotting these signs early gives you time to get a professional assessment and plan the removal properly rather than dealing with an emergency after a branch comes down. Here is what to look for and what to do once you find it.
These are the signs that point most reliably to a tree that is fully dead or close to it:
By late May in the GTA, every healthy deciduous tree should have leaves. If your tree has bare branches in late May or June while neighbours' trees are fully leafed out, that is the strongest single indicator that something is seriously wrong. One completely bare tree standing among fully leafed trees is rarely a timing issue. It is almost always a sign of death or severe decline.
The exception: some trees are genuinely late leafers. Catalpa and Kentucky coffeetree are notorious for being the last trees to leaf out in Ontario, often not showing leaves until June. Know your species before assuming the worst in early May.
This is the simplest and most reliable DIY check. Use a fingernail or a small knife to scratch through the outer bark of a twig or small branch. The layer just beneath the bark, called the cambium, should be green and slightly moist in a living tree. If you scratch multiple branches from different parts of the tree and consistently find dry, tan, brown or grey tissue beneath the bark, those sections are dead.
Test branches at several heights and in different parts of the crown. A tree that is dead in the upper canopy but still alive near the base may still have options. A tree that is dead everywhere you test is fully dead.
Healthy bark is firmly attached to the trunk. When a tree dies, the layer between the bark and the wood dies and dries out, causing bark to loosen, crack away in large sections or slide off when pressed. If you can push your hand against the bark on the trunk and it moves, that is a clear sign of significant internal tissue death.
Some bark peeling is normal for certain species. Silver birch peels naturally. Sycamore exfoliates in distinctive patches. But large sections of bark coming off a maple, oak or ash that are not normal for that species is a meaningful warning sign.
Bracket fungi (sometimes called shelf fungi or conks) growing on the trunk or at the root flare are a sign of internal wood decay. The fruiting body you see on the outside of the tree represents extensive fungal mycelium spreading through the wood inside. By the time bracket fungi are visible on the outside, significant decay has already occurred internally.
Not every fungal growth means immediate removal. The location of the decay in the tree, how much structural wood remains, and whether the root system is compromised are all factors in the risk assessment. An arborist uses a resistance drill or other tools to map internal decay and assess how much solid wood is left holding the tree up.
Every tree carries some dead branches, particularly in the interior of the canopy where light does not penetrate. A modest amount of interior deadwood is normal. When the dead branches extend throughout the outer canopy or when large-diameter dead limbs are present in the upper crown, the tree is in significant decline. Dead branches in large trees fall without warning and do not require a storm to let go. Weight, wind and temperature changes all trigger sudden deadwood failures.
Honey mushrooms and other root decay fungi growing around the base of a tree indicate active decay in the root system. Root decay is particularly concerning because you cannot see the extent of it from the surface, and it undermines the tree's structural anchorage. A tree with active root rot can topple in conditions that a healthy tree would easily withstand.
Not every struggling tree is beyond help. These signs suggest stress or decline that may be reversible with the right care:
Our ISA certified arborist provides honest assessments for trees showing signs of decline. We tell you what we actually see, not what generates the most billable work. Serving Toronto and the GTA.
A large dead tree close to a structure or frequently used outdoor space is a priority. As dead wood dries it loses the fibrous flexibility that keeps it together under load. A large dead tree in a Toronto backyard becomes significantly more hazardous each passing season, and the rate of deterioration accelerates in species like ash that are hit by Emerald Ash Borer. If you have a dead ash that you know needs removal, do not wait for a convenient time in the spring. The wood weakens fast.
Individual dead branches in a living tree are also a real hazard. A large dead limb in the crown of an otherwise healthy maple can fall at any time and does not give you a warning. Deadwooding, removing those individual dead limbs, is a straightforward pruning task that significantly reduces hazard without removing the whole tree.
Yes. Toronto's Chapter 813 applies to dead trees the same as living ones if the trunk measures 30cm DBH or more on private property. The bylaw does not make exceptions for trees that are no longer alive. You still need an arborist report and a permit before removing a dead protected tree.
The one practical adjustment: Toronto Urban Forestry generally processes dead tree applications somewhat faster than contested living tree applications, because the case for removal is clearer. A well-documented arborist report confirming death and structural hazard usually moves through the process without a site inspection delay.
For more detail on the permit process for dead trees specifically, see our guide on dead tree removal permits in Toronto.
If you have identified some of these warning signs on a tree in your yard, the right next step is a professional assessment from an ISA certified arborist. The assessment gives you an honest answer on whether the tree is saveable, whether it is a genuine hazard right now, and what the permit and removal process will look like if removal is the right call.
Do not wait until the tree shows all the warning signs or until a branch comes down. An early assessment gives you time to plan the permit, schedule the removal at a convenient time, and budget appropriately for the full cost including the arborist report, permit and stump grinding.
How do I know if my tree is dead?
The scratch test is the most reliable check: scratch a small area of bark on a branch and look for green, moist tissue underneath. Dry, brown or grey tissue means that section is dead. No leaf-out in late spring, peeling bark, bracket fungal growth and brittle snapping branches are the main visible signs.
Can a half-dead tree be saved?
Sometimes. If the root system and main trunk are structurally sound and the cause of decline can be addressed, a tree can often be managed with pruning and care. An ISA certified arborist can tell you honestly whether the tree is worth saving and what the realistic outcome looks like.
Do I need a permit to remove a dead tree in Toronto?
Yes. Chapter 813 applies to dead trees the same as living ones. If the trunk is 30cm DBH or more, you need a permit and an arborist report before removal, regardless of the tree's condition.
Is a dead tree dangerous?
Increasingly so over time. Dead wood loses structural integrity as it dries, root anchorage deteriorates, and decay spreads. A large dead tree near a structure or high-traffic area should be removed promptly rather than left standing.
What is the scratch test for trees?
Scratch a small patch of outer bark on a twig or branch. Green, moist tissue underneath means that section is alive. Dry, brown or grey tissue means it is dead. Test multiple branches at different heights for a full picture.
If your tree is showing warning signs, call us for an honest assessment. We tell you what we see and what your options are, whether that is a targeted pruning, monitoring, or starting the permit process for removal.