Renton, WA Landscaping Rules: Weed Ordinances (2026)

Renton adopted the 2018 Edition of the International Property Maintenance Code (IPMC) as its property maintenance standard, amending several sections to fit local conditions. 4, Weeds, to set two separate thresholds: developed property must stay under 12 inches of weed or plant growth, while vacant land gets a looser 24-inch ceiling. The ordinance defines 'weeds' broadly as grasses, annual plants and vegetation other than trees or shrubs, but carves out cultivated flowers and gardens so landscaped beds are not swept into the prohibition. Noxious weeds get no height allowance at all: the code prohibits them outright, tying the rule to noxious-weed status rather than a simple mowing schedule.

Enforcement runs through the code's own notice process rather than an automatic citation. When an inspector documents a violation, the owner or agent in charge of the property receives a notice of violation; only after that notice goes unheeded does the matter move into the procedures of Chapter 1-10 RMC, Code Enforcement. The IPMC weeds amendment was adopted by Ordinance 6034 on November 15, 2021. Because RMC 4-5-130 also governs vacant buildings, outdoor storage limits, and fire and security standards for empty structures, the weeds provision sits inside a broader property-maintenance framework.

Appeals of any notice issued under this chapter follow RMC 4-8-110, and general chapter violations are treated as misdemeanors under RMC 4-5-150 and RMC 1-3-1 unless the specific Chapter 1-10 enforcement track applies instead.