Seattle, WA Invasive Plant Rules: Tree-of-Heaven Removal (2026)
Rules requiring removal of Ailanthus altissima (tree-of-heaven), the invasive species that hosts spotted lanternfly, including state programs and city-level mandates.
Research in progress
We are currently verifying Seattle's specific local ordinance for tree-of-heaven removal. In the meantime,Washington state law generally applies, and below you'll find guidance for finding the official rules and links to related Seattle ordinances we've already verified.
Washington State Law Context
Washington state law provides the baseline framework for tree-of-heaven removal across all municipalities in the state. Individual cities like Seattle may adopt additional local rules on top of state requirements, which is what makes checking your specific city ordinance important. For Seattle residents, the safest approach is to follow state law as a baseline and contact City Hall for any additional local requirements.
You can browse all Washington invasive plant rules to see how cities across the state regulate this topic.
How to find official Seattle Tree-of-Heaven Removal rules
- Search for "Seattle WA municipal code" to find your city's online code portal (Municode, eCode360, or American Legal Publishing are the most common).
- Look for chapters covering invasive plant rules, zoning, nuisance, or property maintenance — that's where most tree-of-heaven removal rules live.
- Contact Seattle City Hall's code enforcement, planning, or community development department for clarification.
- Check with your HOA if applicable — many HOAs have stricter rules than the city itself.
Other invasive plant rules verified for Seattle
We've verified the following invasive plant rules for Seattle: