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.

Join us to celebrate a year of collaborative successes!

The Greenway Annual Celebration brings together supporters from across the region to celebrate our coalition’s accomplishments in land conservation, ecological restoration, recreation projects, and connecting people with nature over the past year. 

Read the Latest News

Hikers walking through a green forest

Join Us at an Upcoming Event

There are no Volunteer Events at this time.

Environmental education field trips are back!

For nearly 25 years, we have been engaging 4th-12th grade students in King County with high-quality, science-based outdoor learning opportunities that foster teamwork, nurture the imagination, increase students’ sense of ownership over their learning, and instill a conservation ethic.