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Tree Risk Assessment · Oregon

Tree Risk Assessment in Portland, OR

Tree Risk Assessment in Portland, OR: a tree risk assessment is an arborist's evaluation of how likely a tree (or part of it) is to fail, what it would hit, and how bad the consequences would be. Locally, emerald ash borer: Found in Forest Grove in June 2022; Portland's ash are at risk.
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Tree problems in Portland, OR that call for arborist risk assessment

  1. 1

    Emerald ash borer

    Found in Forest Grove in June 2022; Portland's ash are at risk.

  2. 2

    Ice storms

    Freezing rain from Columbia Gorge east winds, as in February 2021 and January 2024.

  3. 3

    Wet-soil windthrow

    Tall conifers uproot in winter windstorms on saturated soil.

What tree risk assessment covers

A tree risk assessment is an arborist's evaluation of how likely a tree (or part of it) is to fail, what it would hit, and how bad the consequences would be.

How tree risk assessment works, step by step

Describe the tree and what it's near, and you'll reach an independent provider serving Portland, OR.

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Trees in Portland, OR that most often need arborist risk assessment

Douglas-fir
Very tall near houses; root rot and windthrow risk
Oregon white oak
Native; valued and protected
Bigleaf maple
Heavy limbs fail under ice

Tree rules and permits in Portland, OR

  • Private trees 12 inches or more in diameter are regulated by Portland's Title 11 unless Title 33 zoning rules apply instead.
  • Removing a single tree 20 inches or larger, or five or more trees 12 inches and up, is a Type B permit: review, public notice, possible appeal and replacement up to inch for inch at the City Forester's discretion.
  • Street trees need a permit for pruning, removal or planting.

Sources (checked 2026-10-03)

Rules change and details depend on your exact property. Confirm with the city or county before work starts. This isn't legal advice.

What affects the price of arborist risk assessment in Portland, OR

The usual drivers are size, access, what's under the tree and cleanup; see the full list for arborist risk assessment.

In Portland, OR: Older Portland neighborhoods have narrow lots with big conifers between houses, overhead lines along streets and steep West Hills lots where equipment access is limited. Sectional removal with climbers and rigging, or cranes from the street, is common.

Tree Risk Assessment in Portland, OR: common questions

Do I need a permit for tree Risk Assessment in Portland, OR?

Private trees 12 inches or more in diameter are regulated by Portland's Title 11 unless Title 33 zoning rules apply instead. Removing a single tree 20 inches or larger, or five or more trees 12 inches and up, is a Type B permit: review, public notice, possible appeal and replacement up to inch for inch at the City Forester's discretion.

Which trees in Portland, OR most often need arborist risk assessment?

Douglas-fir: very tall near houses; root rot and windthrow risk Oregon white oak: native; valued and protected Bigleaf maple: heavy limbs fail under ice

Emerald ash borer: what does it mean for arborist risk assessment in Portland, OR?

Found in Forest Grove in June 2022; Portland's ash are at risk.

Ice storms: what does it mean for arborist risk assessment in Portland, OR?

Freezing rain from Columbia Gorge east winds, as in February 2021 and January 2024.

Wet-soil windthrow: what does it mean for arborist risk assessment in Portland, OR?

Tall conifers uproot in winter windstorms on saturated soil.

How do access and lot layout in Portland, OR affect arborist risk assessment?

Older Portland neighborhoods have narrow lots with big conifers between houses, overhead lines along streets and steep West Hills lots where equipment access is limited. Sectional removal with climbers and rigging, or cranes from the street, is common.

Other tree services in Portland, OR

Tree Risk Assessment nearby

More about Portland, OR: tree removal in Portland, OR · all locations

Need arborist risk assessment in Portland, OR?

Call to reach an independent tree-service provider that serves Portland, OR. Calling is free and you decide whether to hire anyone.

Call for tree service

By calling, you agree that your call may be recorded and routed to an independent local tree-service provider, who may call or text you back about your request. Calling is free and does not obligate you to hire anyone. See our Privacy Policy.

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