Tigard, OR Landscaping Rules: Weed Ordinances (2026)

Tigard defines noxious vegetation in § 6.01.020. Weeds more than 10 inches high qualify, and so does grass more than 10 inches high. The definition also reaches poison oak, poison ivy or similar vegetation, vegetation likely to cause fire, blackberry bushes that extend into a right-of-way or across a property line, vegetation that is a health hazard, and vegetation that impairs the view of the right-of-way or makes its use hazardous. Paragraph 9 carves out agricultural crops unless the vegetation is a health hazard, a fire hazard or a traffic hazard.

Section 6.02.020.A bars any responsible party from allowing paragraphs 1 through 7 vegetation on the property or in the right-of-way abutting the property, so the duty extends past the lot line. Section 6.02.020.B requires the responsible party to cut down or destroy grass, shrubbery, brush, bushes, weeds or other noxious vegetation whenever needed to keep it from becoming unsightly or, for weeds and other noxious vegetation, from maturing or going to seed. Section 6.02.020 sets no mowing calendar and no separate height for improved and unimproved lots: the 10-inch line applies to any property.

A responsible party is the owner, an agent with authority over maintenance, any occupant including a tenant, the person who created or allowed the condition, or a foreclosure or bankruptcy trustee. Property subject to a greenway easement has its own standard in § 6.02.040.B.2: grass cut to a height not exceeding 10 inches, except when some natural condition prevents cutting. Section 6.02.040.D requires actual or constructive notice of those standards before a violation is found.