Mountains to Sound Greenway Trust

The Mountains to Sound Greenway Trust leads and inspires action to conserve and enhance the landscape from Seattle across the Cascade Mountains to Central Washington, ensuring a long-term balance between people and nature. Created in 1991, Mountains to Sound Greenway Trust protects and enhances a 100-mile corridor of permanent open space lands along Interstate 90 from Seattle to Central Washington. The Greenway embraces city parks and trails, wildlife habitat, working and protected forests, recreational opportunities in nature, local history, scenic beauty, tourism, and educational activities that promote a balance between population growth and a healthy environment.

Charity Navigator Ratings

Overall Rating

(4/4)|98.23 Score


(4/4)|97.5 Score

Accountability & Transparency

(4/4)|100 Score



Headquarter Address

2701 First Avenue
Suite 240
Seattle, WA 98121