Signs Your Tree Won't Survive Winter: A Certified Arborist's Checklist

Not every tree needs to survive winter — and knowing which ones won't is exactly the kind of judgment an ISA Certified Arborist is trained to make. Here's a practical checklist we use during fall assessments across Eugene and Lane County.

Fungal conks or mushrooms at the base or trunk are one of the clearest signs of internal decay. These fruiting bodies mean a fungal organism is actively breaking down wood fiber inside the tree, often long before any external symptoms appear.

Vertical bark cracks or seams running up the trunk can indicate included bark, frost cracking, or internal splitting — all of which weaken the tree's structural integrity under wind load.

A lean that's new or has visibly increased is a red flag, especially when paired with soil heaving or exposed roots on the opposite side, which suggests the root plate is failing.

Canopy dieback — significant sections of the crown with no leaves or needles while the rest of the tree looks healthy — often signals root damage, disease, or vascular problems that will only worsen through a wet winter.

Cavities or hollow sections, detectable by sound (a hollow tap) or visible openings, reduce the structural wood available to resist bending forces in wind.

Finally, proximity matters as much as condition. A moderately compromised tree over an open field is a different risk than the same tree over a bedroom, driveway, or property line — target assessment is part of any proper hazard evaluation.

This checklist is a starting point, not a substitute for an in-person evaluation. Internal decay, root plate condition, and structural defects often require hands-on inspection to assess accurately.

If any of these signs sound familiar, schedule a professional risk assessment before winter weather arrives. Call Wolfpack Tree Care at 541-556-9256 — we're ISA Certified Arborists serving Lane County year-round.