Seven warning signs a tree may fail in the next storm

Why trees fail

Healthy, well-structured trees rarely fail in ordinary storms. Most failures we clean up after share a few common defects that were visible for months or years beforehand. Knowing what those defects look like lets you call for an assessment before the damage, not after.

None of these signs automatically means a tree must come down. Many can be managed with pruning, cabling or monitoring. But each one deserves a closer look from a qualified arborist.

1. Cracks and splits

Vertical cracks in the trunk or at the junction of two large stems are among the most serious defects. Look especially where two trunks of similar size meet in a tight V with bark pinched between them. That included bark prevents a strong wood connection.

2. Fungal conks and mushrooms

Shelf-like conks on the trunk or mushrooms around the root flare indicate internal decay. The visible fungus is only the fruiting body. The decay behind it may be extensive, and some root rots can topple a tree that still has a full green canopy.

3. A new or changing lean

Trees that have always leaned usually compensate with reaction wood. A lean that appears suddenly, often with soil heaving or cracking on the side opposite the lean, suggests root failure and should be treated as urgent.

4. Dead or hanging branches

Arborists call these widowmakers for good reason. Dead limbs larger than a few inches in diameter over driveways, patios and play areas should be removed promptly.

5. Root damage from construction

Trenching for utilities, new driveways and grade changes within the root zone can cut a large share of a tree's structural roots. Decline often shows up two to five years later as thinning in the upper crown.

6. Cavities and hollows

Many trees live for decades with hollows. What matters is how much sound wood remains around the cavity. We use sounding mallets and, when needed, resistance drilling to measure shell thickness.

7. Sudden canopy loss

Early fall color, small leaves, or a thin crown in midsummer can signal root problems, disease or insect attack. In our region, emerald ash borer on ash and hemlock woolly adelgid on hemlock are frequent causes.

Most failures we clean up after were visible for months beforehand.

What to do next

Take photos from a few angles and note what is underneath the tree. Then book an assessment. Our TRAQ-qualified arborists rate the likelihood of failure and the consequences in plain language, and give you a prioritized plan. If a tree is actively cracking or has fallen on a structure, call the storm line instead.