Sky Country Trailhead, Bellevue WA
Saturday, October 25th, 2025
Welcome to the 2025 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 a portion of every entry going to KC Parks.
October 25: 5K, 7.6 Mile Cross Country, 19.5 Miles & 50K
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.
If you have had COVID-19 symptoms in the last 10 days or have known exposure to someone with COVID-19, please skip this race.
We acknowledge that our running opportunities are built on the purposeful removal of Native peoples. 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 while participating in SRC events. These may be used for advertising and promotional purposes.
Please bring a refillable water container for use at aid stations and post-race.
Thanks to runners like you, the Cougar Mountain Trail Run Series has raised over $250,000 for King County Parks. Join Seattle Running Club and Northwest Trail Runs in making the 21st annual event bigger and better than ever!
Just 15 minutes from Seattle, the course features lush forest trails, hills, and wetland habitats.
If you are a member of Seattle Running Club, you may have received a discount code for 20% off. Please provide your member number to use this code.
Dogs are not allowed due to USATF Sanctioning and Insurance Requirements, despite park policies on leashed dogs.
The top 3 Men, Women, and Nonbinary Runners in each event will receive a podium prize. Our August 14.5-Mile Race will serve as the USATF PNTF championships with prize money announced closer to the event.
For more details and to register, visit the official race page: Cougar Mountain Trail Run Series.
Course Map
Suggested Races
Find The Run Newsletter