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Join the 1 Million Trees planting effort to help pull carbon dioxide out of our atmosphere.

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Outdoor volunteer events

Come volunteer to help improve King County Parks’ stream corridors and urban forests. This month projects include removing invasive plants to restore habitat and diversity to our parks, moving woodchip mulch to protect young plantings and potting up native trees for future planting in restoration sites. Native trees and shrubs improve the area for wildlife and water quality – they need help to survive and thrive!

To join a planting event, please register with the volunteer coordinator listed with each event. 

Events are on Saturdays from 9:00 AM to 1:00 PM unless otherwise noted*.

To join a planting event, please register with the volunteer coordinator listed with each event.

    Volunteers attack the weeds
  • Saturday April 30
    Cavanaugh Pond Natural Area (Maple Valley)
    Come help the young native trees and shrubs get established by mulching and weeding.
    Contact Tina Miller.
  • Saturday May 7
    Fred Habenicht/ Maple Valley Rotary Park (Maple Valley)
    Join us in mulching rhododendrons and native plants installed in the park last winter; as well as removing blackberry from the borders of this riverside park along the Cedar River.
    Contact Lina Rose.
  • Saturday May 7
    Equestrian Trail Opportunity (Redmond)
    hosted by the King County Executive Horse Council. Please come join fellow “horse folks’ to help maintain this outstanding horse park with its round pen and outdoor arena located at the trailhead of fantastic hose trails.
    Contact Laurie Clinton.
Ivy removal
"ahhhh, say the trees – thanks volunteers for helping us breathe!!"

Backcountry trail work

Give back to those trails you love! Join King County Parks and the Washington Trails Association to rebuild and repair backcountry trails.  Learn to retread a trail, build a turnpike or solve drainage issues.

To register contact Washington Trails Association (WTA) at or call 206-965-8561.

Please note that this event requires hiking to the site; event is limited to 20 people and typically would be 6-12 volunteers in size.

  • March 29 – April 2
    Cougar/Squak Corridor Park – near Issaquah
Trail work

Other volunteer opportunities

Miller and Walker Creeks volunteer calendar
Plant native trees and shrubs, pull invasive, non-native plants and clean up litter at these Puget Sound creeks.

Native plant holding facility
Groups are needed to care for salvaged native trees and shrubs at our holding facility near Sammamish. To schedule a group work party, please contact Cindy Young.

Adopt-a-Park or Trail & Park Ambassador Programs
These programs provide opportunities for groups or individuals to help maintain King County's 180 parks, 175 miles of regional trails, and 130 miles of backcountry trails.  For more information please contact Laurie Clinton, volunteer program manager.

Salmon counts and habitat restoration

Volunteer Lake Stewardship Program
Get outside to help monitor water quality at select lakes in King County.

Be a Weed Watcher
Sign up to adopt a trail or lake , keep an eye out and enter weed survey data and locations.

Master Recycler Composter Program
Sign up for free training to learn about waste reduction, recycling, solid waste impacts on climate change and public outreach, and help other citizens reduce waste.

For more information about volunteering in King County, please contact Laurie Clinton, Volunteer Coordinator, King County Parks and Recreation Division.