Gateway Bridge over a blue river with lush greenery

endless discovery

Within Reach

Welcome to the Mountains to Sound Greenway National Heritage Area

The Mountains to Sound Greenway National Heritage Area is a unique geographic corridor made up of connected ecosystems and communities spanning 1.5 million acres from Seattle to Ellensburg along Interstate-90 in Washington state. The Mountains to Sound Greenway Trust is a coalition-based organization that leads and inspires action to conserve and enhance this special landscape, ensuring a long-term balance between people and nature.

About the Mountains to Sound Greenway Trust

Read the Latest News

Our partners and supporters play a crucial role in making a positive impact on our local environment, and we can’t wait to show you the inspiring results! As you scroll through our interactive Annual Report, we hope you’ll be reminded of the meaningful impact we can have right here in our local communities and find ways to get involved in 2024!