Tree Protection in Washington County, OR (2026)

3 rules for unincorporated Washington County, Oregon.

Verified from official government sources

Note: These county rules apply to unincorporated areas of Washington County. If you live within an incorporated city, that city's own rules apply — see the city list below.

Tree Removal Permits

Washington County regulates significant tree removal through CDC §407 and sensitive areas under CWS rules. Cities like Beaverton (BC 9.04), Hillsboro (HMC 12.32), and Tigard (Urban Forestry Manual) have robust tree codes. Street trees cannot be removed without permit.

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Some Restrictions

Full ordinance details →Official source ↗

Heritage & Protected Trees

Washington County cities including Beaverton, Forest Grove, and Hillsboro designate heritage or landmark trees. Oregon Heritage Tree program through the State Historic Preservation Office recognizes culturally and historically significant specimens countywide.

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Heavy Restrictions

Full ordinance details →Official source ↗

Tree Replacement Requirements

Tree replacement requirements apply when permitted removals occur in Washington County cities. Beaverton, Tigard, and Hillsboro require 1:1 to 3:1 replacement planting with minimum 1.5-2 inch caliper native/adapted species, with fee-in-lieu options for the municipal tree fund.

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Some Restrictions

Full ordinance details →Official source ↗

All Washington County ordinances

See every category we cover for Washington County — parking, noise, fences, fires, animals, pools, and more.

Washington County Ordinance Hub →