Cougar Mountain Trail Run Series (June)

Welcome to the Cougar Mountain Trail Run Series

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.

Race Information

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)

Upcoming Events

• May 9: 5.1 Miles &: 10.8 Miles - 9 AM start for all races, 12:00 PM cut-off (~16:40 pace for 10.8 miles)
• July 11: 5K, 10.8 Miles &: 19.5 Miles - 9 AM start for all race, 2:30 PM cut-off (~16:55 pace for 19.5 miles)
• August 8: 5K, 14.5 Miles &: 26.2 Miles - 8:30 AM start for the 14.5 and 26.2, 9 AM start for the 5K, 4 PM cut-off (~17:10 pace for the marathon)
• October 24: 5K, 7.6 Mile Cross Country, 19.5 Miles &: 50K - 8 AM start for the 19.5 and 50K, 9 AM start for 7.6 Miles and Cross Country event, 9:30 AM start for 5K, 5 PM Cut-off (~17:25 pace for 50K, ~19:30 pace for early start)

Series Awards

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.

Registration Information

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.

Reasons to Sign Up

• Well-marked Trails: Trails with distances that are perfect for all experience levels
• Community: Surround yourself with members of the trail-running community
• Post-race Food: Food and libations, including beer from Flying Lion Brewery
• Support Parks: Raise money for King County Parks: $15/runner donated to the parks

Safety Guidelines

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!

Land Acknowledgment

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.

Photo Consent

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.

A Greener Event: Cup Free

The series continues to reduce trash. We ask that runners bring a refillable water container to use at aid stations along the way.

Join Us

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!

Location

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.

Seattle Running Club Discount

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.

No Dogs

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.

Awards

The top 3 Men, Women, and Nonbinary Runners in each event will receive a podium prize.

Additional Information

For more details or to register, visit the Cougar Mountain Trail Run Series registration page.