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Chapters · Greater Seattle & Issaquah Alps

Cascades to Sound.

From Tiger Mountain to Galbraith — the largest chapter in the Evergreen network, serving the Seattle metro area and the I-90 corridor.

Overview Leadership Work Parties Projects Donate Local

01 / Regional Overview

Where we ride.

The Cascades to Sound chapter covers the Seattle metro area, the Issaquah Alps, the I-90 corridor, and partner systems north to Bellingham. It's the largest chapter in the Evergreen network — both by membership and by trail count.

Signature trail systems include Tiger Mountain, Duthie Hill Mountain Bike Park, Tokul, Raging River, Olallie State Park, Galbraith Mountain (in partnership with WMBC), Stossel Creek, Tolt MacDonald, and the I-5 Colonnade urban bike park.

The chapter runs weekly work parties from spring through fall, plus winter maintenance days and an annual chapter ride. New riders are welcome at every event — no experience required, no equipment to bring beyond water and gloves.

{{ range slice (dict "value" "2,400+" "label" "Chapter members") (dict "value" "8,000" "label" "Volunteer hrs/yr") (dict "value" "12" "label" "Active trail systems") }}
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Join this chapter Email chapter lead

02 / Chapter Leadership

Your local crew.

The volunteers who lead this chapter — work party organizers, advocacy point people, and your direct line to local trail decisions.

{{ range slice (dict "name" "Chapter Co-Chair" "role" "Co-Chair") (dict "name" "Chapter Co-Chair" "role" "Co-Chair") (dict "name" "Trail Coordinator" "role" "Trail Coordinator") (dict "name" "Advocacy Lead" "role" "Advocacy Lead") }}

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03 / Get Out There

Work parties
this month.

Show up. Build trail. Find your people. The list below is filtered to Cascades to Sound — for the full statewide calendar, hit the link.

All chapter events ↗
{{ range slice (dict "date" "Sat · May 18" "title" "Tiger Mountain" "meta" "Bridge build · 4 hrs · 8 spots open") (dict "date" "Sat · May 25" "title" "Galbraith Mountain" "meta" "Drainage · 6 hrs · 12 spots open") (dict "date" "Sun · Jun 1" "title" "Issaquah Alps" "meta" "Tread repair · 5 hrs · 6 spots open") }}
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{{ .meta }} RSVP ↗
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04 / Local Projects

What's being built
nearby.

Active trail projects in the Cascades to Sound region. Your chapter dues and donations help fund all of them.

{{ range slice (dict "status" "In Progress" "title" "Tiger 3 Reroute" "body" "Sustainable rebuild of the popular descent. New flow features and improved drainage. 60% complete.") (dict "status" "Funding" "title" "Tokul Connector" "body" "3-mile connector between Tokul East and West, opening up loops without backtracking.") (dict "status" "Planning" "title" "Galbraith Phase 4" "body" "Continued partnership with WMBC. Adding intermediate-rated singletrack on the south side.") }}
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Stay connected
with Cascades to Sound.

Get chapter updates, work party notices, and local trail news.