How to Tell If a Tree Is Dead: A Sioux Falls Homeowner’s Guide
Every fact cited
The most reliable test doesn’t require an arborist visit: scratch a small patch of bark on a few branches with a knife or your thumbnail. Green, moist tissue underneath means that branch is alive. Brown, dry, brittle tissue all the way through means it’s dead. Because a tree can die unevenly — one side going before the other — check several branches in different parts of the canopy rather than a single spot.
Beyond the scratch test, a handful of visual signs tend to show up together on a genuinely dead tree: bark that’s sloughing off in sheets rather than staying tightly attached, a complete absence of buds even during the growing season, fungal conks or shelf mushrooms growing directly from the trunk or major limbs (a strong sign of internal decay), and a canopy that stayed bare through an entire growing season rather than just leafing out late.
For ash trees specifically, given confirmed EAB activity in the Sioux Falls area, look also for D-shaped exit holes about an eighth of an inch across, and bark that’s split or flaking to reveal S-shaped tunneling underneath. A tree that shows heavy EAB damage and has already lost its canopy is very likely dead or close to it, and typically isn’t a good candidate for treatment at that stage — that’s a removal conversation, not a treatment one.
Can a tree look dead in winter but actually be alive?
Yes — deciduous trees are bare all winter regardless of health, so the scratch test and bark condition matter far more than canopy appearance during dormant months. Waiting for spring leaf-out is one way to confirm, but if the tree poses any risk, don't wait for that confirmation before getting a professional assessment.
Do woodpeckers on a tree mean it's already dead?
Heavy, sustained woodpecker activity often indicates the tree already has significant insect activity underneath the bark, which is a sign of serious decline even if parts of the tree are still alive. It's worth an arborist visit rather than assuming the tree will recover.