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Most King County offices will be closed on Monday, for Indigenous Peoples' Day.  
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Plant enthusiasts, hikers and others who want to help protect our natural areas are encouraged to join the effort to locate (and control) invasive species in the beautiful Middle Fork Snoqualmie Valley and the Snoqualmie Pass Gateway trails of the South Fork Snoqualmie. Help survey the area's spectacular trail system for invasive weeds so we can stop them before they get entrenched. This class will teach you to identify the highest priority invasive plant species and give you the tools you need to start helping prevent these weeds from spreading into our wilderness areas.

The training is a presentation-based workshop covering the program's goals and methods and focusing on learning to identify the priority invasive plants for the region, using a combination of slides and plant specimens. This is a joint training for King County's Trail Weed Watchers and the PNW‐IPC Volunteer EDRR program. Participants can receive a free invasive plant guide and receive invitations to group hikes and other events.

Additional weed hikes are being coordinated by the Issaquah Alps Trails Club, see their calendar for dates and more information IATC - Hikes and Events

2022 Training Update

Due to COVID-19 public health concerns, this class is being offered online only through PNW-IPC's training program. If conditions allow, we may be able to schedule small in person training hikes. To find out about upcoming events or for more information, contact Skye Pelliccia spelliccia@kingcounty.gov.

Trail weed watcher group hike and training

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).