Greenway Trek

Register now for the 2020 Mountains to Sound Greenway Trek!

Join us for a nine-day camping adventure of a lifetime where you will hike, bike, and float across the Mountains to Sound Greenway National Heritage Area, from Roslyn to Seattle. This 1.5-million-acre landscape boasts stunning natural beauty, friendly communities, and a rich heritage story, and you’ll have a front-row seat to experience it all.

This year, we celebrate the 30th anniversary of the original Trek, where the concept of establishing a Greenway along Interstate 90 was born, and citizens were inspired to thoughtfully shape our region’s growth. Every five years, the community comes together to re-create this special event, and all are welcome to join in the celebration – whether you are a longtime Greenway supporter or have never heard of it before. During this unique recreational opportunity, you will form new friendships and connections while learning about what makes this landscape so special and how we can all work together to champion its future.


  • Full Trip: Saturday, July 11 – Sunday, July 19, 2020
  • A few single day trip options will also be available for those interested (more details coming soon)
  • Early Bird Pricing (until March 31): $549
  • Regular Pricing (after March 31): $649

High school students: Click here to learn more about the Conservation Leader in Training Program, put on in partnership with the Sammamish Community YMCA.

Questions? Click here to read Frequently Asked Questions about the Trek. Email with any remaining questions.


2020 Trek Schedule*

*Exact route and details subject to change

Reflections from Past Greenway Treks:

“The Mountains to Sound Greenway 20th Anniversary Trek represented everything summer is supposed to be. Some of us arrived with friends or family and some of us came alone, but no one stayed a stranger for long.” – Adrienne (read more)

“I think if you ask any of the Trekkers, those 9 days will have been the highlight of their summer. I feel so privileged to be interning for such a great non-profit organization devoted to conserving and enhancing the unique landscape from Seattle to Central Washington encompassing 1.5 million acres. And I got to “trek” 130 of them with a great group of people and beautiful views every day…” – Even (read more)

“ … Our westward path took us through old pioneer towns, working farmlands and bio-diverse forests trails. Weaving our way in and out of many of our region’s life sustaining watersheds we continued on through suburbia, city parks, and into the dense urban neighborhoods of Seattle as we made our way to the western edge of the Greenway. For eight days we became the metaphorical connectors that the Mountains to Sound Greenway Trust has envisioned for this amazing landscape over the past twenty-five years. How can we not feel good about this accomplishment?” – Dale Hoff (read more)