How to Tell If a Tree Is Dying in Spokane: 12 Warning Signs

The good news: trees almost never die suddenly. They warn you for months — sometimes years — before they fail. The bad news: most homeowners don't recognize the signs until the tree is already a structural hazard. After thousands of Spokane tree assessments, here are the 12 specific symptoms we look for, in order of urgency.

Critical Signs (call an arborist this week)

1. New lean toward a structure

If your tree was vertical six months ago and is now visibly tilted toward the house — that's root failure in progress. Look for soil heaving on the opposite side of the lean, or roots lifting out of the ground. Trees in this state can fail in winds as low as 30 mph.

2. Vertical cracks or splits in the trunk

Especially common in cottonwoods and aspens. A vertical seam — even a hairline one — means the tree is splitting under its own weight. These trees often fail catastrophically with no warning.

3. Mushrooms or conks at the base

Fungal fruiting bodies (especially Armillaria, Ganoderma, or Phaeolus schweinitzii) growing at the base or on roots indicate advanced internal decay. The tree may look healthy above, but its structural support is gone.

4. Hollow sound when tapped

Tap the trunk with a rubber mallet or back of an axe. A solid "thunk" means healthy wood. A drum-like "hollow" sound means significant internal cavity. Hollow trees can be safe — but only an arborist can tell.

Serious Signs (get an inspection within 30 days)

5. Top-down dieback

If the upper third of the canopy is bare or dead while the lower branches are alive, the tree is failing from the top. Common in drought-stressed ponderosas across Spokane.

6. Bark falling off in sheets

Healthy trees shed bark in small flakes. Sheets of bark sloughing off, exposing smooth dead wood underneath, means the cambium is dead in that section.

7. Woodpecker damage and small round holes

Pileated woodpeckers and sapsuckers feed on bark beetles. Heavy woodpecker activity on a single tree means it's beetle-infested — and probably already structurally compromised.

8. Sap weeping from trunk holes

Pitch tubes (popcorn-like clumps of sap on the trunk) are the calling card of mountain pine beetle and ips beetle. Once you see these on a ponderosa, the tree usually dies within 1–2 years.

Watch Signs (annual arborist check recommended)

9. Thinning canopy

If your tree is noticeably less leafy or needled than the same species nearby, it's stressed. Could be drought, root damage, soil compaction, or early-stage disease.

10. Dead branches (especially large ones)

Some dead branches are normal. But large dead branches (over 4 inches diameter) in the upper canopy are widow-makers — they fall with no warning. They also indicate the tree is shedding weight it can't support.

11. Roots damaged by construction

Did you have a driveway, patio, foundation, or trench dug within 25 feet of the tree in the last 5 years? Major root damage takes 3–7 years to manifest as canopy decline. The clock is ticking.

12. Soil heaving or cracks at the base

Cracks in the soil radiating out from the trunk, or visible heaving on one side, mean the root plate is moving. Even subtle movement is a serious warning.

What's Actually Killing Spokane Trees Right Now

• Mountain pine beetle and ips beetle (ponderosa pine, lodgepole)
• Drought stress from extended summer heat (all conifers, especially North Side and South Hill)
• Construction root damage (every new development west of Division)
• Aphalara itadori and emerald ash borer (East Coast import — early arrivals detected nearby)
• Armillaria root rot (cottonwoods, aspens, and ornamental fruit trees)
• Salt damage near roads (road de-icing affects parking strip trees)

When to Get a Professional Assessment

If you see any one critical sign, OR two or more serious signs, schedule an on-site arborist assessment. We do free hazard evaluations across Spokane — no obligation, no upsell. If your tree is safe, we'll tell you. If it's not, we'll explain exactly why and what your options are.