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

Plant Trees and Give Back to Local Habitats

Celebrate the start of the planting season on Saturday, October 10 by volunteering to restore healthy urban forests and give back to local habitats. Join the Mountains to Sound Greenway Trust and friends for a morning of planting native trees at Lake Sammamish State Park, followed by free lunch, celebratory remarks, and an optional walking tour of Issaquah Creek!