Landscaping Rules in Washington County, OR (2026)
2 county-level rules, plus city-specific rules for 2 cities in Washington County, Oregon.
Verified from official government sources
Tree Removal & Heritage Trees
Removing trees on unincorporated Washington County land triggers Community Development Code Section 407-3, which applies to all tree removal unless a listed exemption fits, routes hazard, floodplain and Significant Habitat trees to separate review chapters, and bans commercial clear-cutting that would leave fewer than 50 healthy trees per acre.
Washington County Tree Removal Permit Rules
Some RestrictionsWashington County Community Development Code § 407-3 (§§ 407-3.1, 407-3.5)
407-3 Tree Preservation and Removal 407-3.1 Applicability Section 407-3 applies to all tree removal except as specified in Section 407-3.2 below. ... 407-3.5 Removal Standards: ... B. Inside the UGB, the harvesting of forest tree species for the commercial value of the timber shall be subject to the following additional requirement: (1) The harvesting of trees shall use a selective cutting proc...
Weed Ordinances
Uncontrolled weeds, brush or grass on unincorporated property is a declared nuisance under county code: the health department can order it cut within 15 days, and specifically names noxious weeds like Canada thistle, ragweed and gorse.
Washington County Weed & Grass Nuisance Rule
Some RestrictionsWashington County Code § 8.20.030(A)(9) — Nuisances Designated
A.It shall be unlawful for any owner or person in charge of property to maintain or allow to exist, the following things, practice, or conditions on his property, which are declared to be nuisances:...9.Uncontrolled or uncultivated growth of weeds, brush or grass, including but not limited to Jimson, Burdock, Ragweed, Thistle, White Top, Russian Knapweed, Canadian Thistle, Tansy Ragwort or Gors...
Landscaping Rules by City in Washington County
2 cities in Washington County have their own landscaping rules rules. Each link goes to that city's dedicated page with code citations.
All Washington County ordinances
See every category we cover for Washington County: parking, noise, fences, fires, animals, pools, and more.
Washington County Ordinance Hub →