Cougar Mountain Trail Run Series

MAY
9
2026
A trail race at Cougar Mountain Regional Wildland Park offering 5.1 mile and 10.8 mile courses through forest and marshes near Seattle. Organized by Seattle Running Club and Northwest Trail Runs as part of a 21st annual series supporting King County Parks.
Sat 9 May 2026
50 kilometers 26 miles 20 miles 15 miles 11 miles 8 miles 5 miles 5 kilometers

Always double-check with the organizer's website! This page may contain affiliate links.

Cougar Mountain Trail Run Series #1

The event is the first race in the Cougar Mountain Trail Run Series, the 21st annual edition organized by Seattle Running Club and Northwest Trail Runs. It includes two trail distances and takes place at King County’s Cougar Mountain Regional Wildland Park in Newcastle, WA. Registration is available online through May 7 and event-day registration is also available. The registration and start location is Sky Country Trailhead off 166th Way SE, not the Red Town trailhead.

The park features rolling, runnable hills and a mixture of trail types from narrow technical single-track to wider groomed trails. Runners pass through lush forest, fern-lined single-track, hills and marshes. The park is about 15 minutes from Seattle. The series has raised over $250,000 for King County Parks and has contributed many hundreds of hours of trail work.

Distances

  • 5.1 mile trail
  • 10.8 mile trail

Series competition rules require runners to complete at least three of the four races in either the Short Series or the Long Series to be eligible for series standings. Scores from the Short Series and the Long Series may not be combined for ranking. Visit the organization's website for the most recent information.

50 km
50k
26 mi
26.2 Miles
20 mi
19.5 Miles
15 mi
14.5 Miles
11 mi
10.8 Miles
8 mi
8.2 Miles
8 mi
7.6 Mile Cross Country
5 mi
5.1 Miles
5 km
Add Event
Help us complete the calendar!
  • Distance is at least 5 km
  • Event has a website or Facebook page
Website
Optional: Please provide your e-mail address if we may contact you.
Report a change
We will only update the data if the information is also on the website.