About
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 $15 of every entry going to KC Parks.
Events
- July 12 : 5K, 10.8 Miles & 19.5 Miles
9 AM start for all races, 2:30 PM cut-off (~16:55 pace for 19.5 miles)
Series (NEW - BEST 3 OUT OF 4 RACES is eligible for 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.
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 with distances that are perfect for all experience levels
- Community: Surround yourself with members of the trail-running community
- Post-race food and libations, including beer provided by one of our Club's partner stores, Flying Lion Brewery
- 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.
We Run on Native Land: 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.
A Greener Event: Cup Free - Again, this year the series is continuing to reduce the amount of trash created during the event. We ask that runners bring a refillable water container with them on the trail to use at aid stations along the way.
Race Information: Thanks to runners like you, the Cougar Mountain Trail Run Series has raised over $250,000+ for King County Parks and contributed hundreds of hours of trail work.
Just 15 minutes from Seattle, King County's Cougar Mountain Regional Wildland Park is one of the most popular training grounds for area trail runners and the Seattle Running Club.
The course builds on itself throughout the series and brings runners through a lush forest of fern-lined single-track trails, over hills and along marshes and wetland habitats.
This is a great series to supplement the training regime for a fall marathon or ultra.
There is a participant cap and the races tend to sell out, so register early! There are NO REFUNDS!
