Sky Country Trailhead, Bellevue WA
Saturday, June 13th, 2026
Welcome to the 2026 edition of the Cougar Mountain Trail Run Series, put on by Seattle Running Club and Northwest Trail Runs. Our events support King County Parks, with $15 of every entry going to KC Parks.
June 13: 5K, 8.2 Miles &: 14.5 Miles
9 AM start for all races, 1:00 PM cut-off (~16:35 pace for 14.5 miles)
Short Series: May 5.1 Miles, June 8.2 Miles, July 10.8 Miles &: August 14.5 Miles
Long Series: May 10.8 Miles, June 14.5 Miles, July 19.5 Miles, August 26.2 Miles
Top overall Man, Woman, and Nonbinary runners based on cumulative time will receive an award and free entry into next year's series.
Online registration closes at 11:59 PM PDT the Wednesday before each event. We will have day-of registration if you did not register in time.
If you are showing symptoms of any illness or disease, please skip this race. Email races@:seattlerunningclub.org for other race options or it’s a much appreciated donation!
We acknowledge that our running opportunities are built on the purposeful removal of Native peoples who have been the stewards of Seattle-area lands for thousands of years. We accept our ethical responsibility for the ongoing stewardship of the land and support of Native neighbors, colleagues, businesses, and tribes. The Muckleshoot, Duwamish, Stillaguamish, Snoqualmie, and Coast Salish are the Natives of the lands we run on.
I understand and accept that photos/videos/illustrations may be taken of me and/or my personal property while attending/participating in Seattle Running Club (SRC) events/functions. These may be used by SRC for advertising and promotional purposes in any medium, without compensation.
The series continues to reduce trash. We ask that runners bring a refillable water container to use at aid stations along the way.
Thanks to runners like you, the Cougar Mountain Trail Run Series has raised over $265,000+ for King County Parks and contributed hundreds of hours of trail work. Join us in making this 22nd annual event bigger and better than ever!
Just 15 minutes from Seattle, King County's Cougar Mountain Regional Wildland Park is a popular training ground for area trail runners. The course features rolling hills, moderate climbs, and short steep inclines, making it great for training for fall marathons or ultras.
If you are a member of Seattle Running Club, look for the 20% discount code in the newsletter. You will need to provide your member number to use this code.
Dogs are not allowed on the course due to insurance requirements. Although the park permits dogs on leashes, they can pose a safety risk for participants.
The top 3 Men, Women, and Nonbinary Runners in each event will receive a podium prize.
For more details or to register, visit the Cougar Mountain Trail Run Series registration page.
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