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Noxious weeds

King County, Washington

To offer a suggestion or report an error on the King County Noxious Weeds website, please contact Sasha Shaw, education specialist.

Weed maps

King County Noxious Weed Map - interactive and searchable

Click here or on the image below to open the King County Noxious Weed Map.

View and search for noxious weed locations in King County, Washington on this interactive, searchable map. Zoom in, add aerial photo imagery, search for addresses, and more on this helpful map. Data used in the map represents locations where these species were located in previous years and may not represent what is present at the current time. For more detailed information or to answer any questions about this map or the data, contact the staff at the noxious weed program.

King County Noxious Weed Map - click to open map application 

King County iMap - noxious weeds layer

Click here to open King County's iMap layer for noxious weeds in a new browser window.

Zoom in to view map layers including locations of weed infestations by type,roads, streams and aerial imagery among other things. To view information about individual map features, choose the "active" (or queryable) map layer from the layers list, select the Arc IMS Query tool identify tool, and click on one of that layer's features to display associated data. To search for where we have records of particular weeds, select the search tool Arc IMS Search Tool and type in the weed name.

2012 King County noxious weed locations

This map depicts known locations of weed infestations for regulated noxious weed species in King County based on 2012 surveys. Click map below for larger image or download full size map (file size 1.83 Mb, Adobe Acrobat format).

Map of regulated noxious weeds in King County, Washington based on 2012 surveys - click for larger image

2009 invasive plant and noxious weed surveys in the Middle Fork and South Fork Snoqualmie River basins

2009 Map of Weeds in Middle and South Fork Snoqualmie Basins - click to download mapThis map shows locations of invasive plants and noxious weeds identified by the Upper Snoqualmie Watershed Invasive Weed Control Project, a cooperative weed management partnership of the King County Noxious Weed Control Program, Mountains to Sound Greenway Trust, the Mt. Baker Snoqualmie National Forest and the Washington State Department of Natural Resources. Weed surveys were achieved through a combination of Noxious Weed Program staff, Greenway staff, trained Weed Watcher volunteers, and the 2009 participants of the WSU Extension Youth Environmental Leadership Institute program. Some of the widespread species were only recorded in areas where they were less abundant. Some of the species included in the survey are not on the Washington State Noxious Weed List but do appear to be invasive in this watershed. Click the map image to download the full size map (file size 1.98 Mb, Adobe Acrobat format).

Related information

Related agencies


Program offices are located at 201 S. Jackson St., Suite 600, Seattle, WA 98104. To contact staff, see the Noxious Weed Control Program Directory, send an email, or call 206-477-WEED (206-477-9333).