The WSU Extension King County Master Gardener Program
Welcome to the WSU Extension King County Master Gardener Program
Are you interested becoming a Master Gardener or enrolling in the Washington State Green School?
Green School offers two distinct options in its online course: one for individuals looking to enhance their gardening skills through research-based horticultural and environmental stewardship, the Washington Gardener course, and another for those who wish to take it further by becoming a WSU King County Extension Master Gardener Program volunteer.
WSU King County Extension Master Gardener Applications are now open!
King County Master Gardener applications are open June 15th through August 16th, 2026. Learn the science of sustainable gardening. Join Green School to expand your gardening knowledge and explore growing your own food, soil science, pest management, climate resilience, pollinators, and find out about all the benefits that consumer horticulture has on individuals, families and communities.
Washington Gardener Certificate registration opens from August 17th through September 30th, 2026
More Information
What we do:
Each year we train new volunteers, equipping them with foundational knowledge to become horticultural educators in their communities. Trained volunteers must continue their volunteer and educational development in subsequent years to give back to the community and stay abreast of current research and our ever-changing environment. Volunteer hours and learning requirements ensure that our Master Gardeners’ skills and knowledge are always up to date.
Our Volunteer Hour Requirements
WSU Extension Master Gardener Interns – 40 service hours must include:
- 15 Answer/Plant Clinics hours, minimum, and
- 10 Demonstration Gardens hours, minimum, and
- additional service* hours, as needed, to complete a total of at least 40 service hours
Certified WSU Extension Master Gardeners:
- 25 service* hours, and
- 10 Continuing Education hours
Emeritus WSU Extension Master Gardeners:
- 5 service* hours, and
- 5 Continuing Education hours
*Note: Service hours may include any combination of Answer/Plant Clinics, Demonstration Gardens, Other Educational Delivery, Program Support, and Youth Outreach hours.
For questions about volunteer requirements and policies, please contact the Program Office at king.mg@wsu.edu.
Extension Master Gardener Educational Outreach
Pest Alert
Japanese beetle
European chafer beetle
