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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.

Explore the Greenway Trips Are Back!

Explore the Greenway Trips are unique, behind-the-scenes opportunities that highlight the rich history, ecology, and recreational opportunities within the Mountains to Sound Greenway National Heritage Area. Whether you’re just learning about the Greenway NHA for the first time or are a longstanding supporter, all are welcome to enjoy a fun day of discovery and community building out on the Greenway NHA landscape.

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