Mountains to Sound Greenway Trust - Connecting Ecosystems & Communities

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 has been working for 35 years to conserve and enhance this incredible landscape — building and maintaining trails, restoring wildlife habitat, and connecting youth to the outdoors through environmental education. Through our mission, we strive for a long-term balance between people and nature.

Learn more about The Mountains To Sound Greenway Trust

Give Back to the Trails You Love

Celebrate National Public Lands Day on Saturday, September 26 by volunteering on some of the most iconic trails and recreation areas near Seattle. Join the Mountains to Sound Greenway Trust and our partners for a morning of trail work and habitat restoration in the Middle Fork Snoqualmie Valley, followed by a Cheers for Volunteers celebration with free food, drinks, and giveaways!