Noxious Weeds List

Noxious Weed List

Each spring the State Board releases an update of its list of noxious weeds in Washington State. The laws and regulations regarding noxious weeds are stated in Chapter 17.10 of the Revised Code of Washington and Chapter 16-750 of the Washington Administrative Code.

Noxious Weeds in Snohomish County

2023:Classes and Status

• Class A Weeds - Class A noxious weeds are those noxious weeds not native to the state that are of limited distribution or are unrecorded in the state and that pose a serious threat to the state. These weeds are a threat to all counties of the state and eradication is required.
• Class B Weeds - Class B noxious weeds are those noxious weeds not native to the state that are of limited distribution or are unrecorded in a region of the state and that pose a serious threat to that region. Control is required of the following weeds in Snohomish County.
• Class B Designated - Class B designated weeds are common in the county and are not designated by the State Weed Board to be controlled in that county, however the County has chosen to control these weeds and have included them on the County Weed List. Control in Snohomish County is required.
• Class C Weeds - Class C noxious weeds are designated by the State Weed Board as noxious so any county within the state may control these weeds within the county if they desire. Snohomish County has chosen to control the following list of Class C noxious weeds. Control in Snohomish County is required.
• Non-Regulated Noxious Weeds (PDF) - Class B and C weeds from the state noxious weed list also impact the county, but are already widespread. Property owners in Snohomish county are not required to control these species, but control is recommended.

Garden Wise (PDF) is a guide depicting various noxious weeds and the suggested alternatives for each that are native plants or safer for our area.