Cougar Mountain Trail Run Series (October)
Updated
Saturday, October 31, 2026, first start 8:00 AM, in Bellevue (Sky Country Trailhead). Distances: 5K, 7.6 miles, 19.5 miles, 50K. Entry from $40 to $100.
- Date
- Saturday, October 31, 2026
- Start time
- 8:00 AM (earliest wave)
- Location
- Sky Country Trailhead, Bellevue, WA 98006
- Area
- Eastside & South King, Seattle
- Distances
- 5K7.6 miles19.5 miles50K
- Course
- Trail (dirt or single-track on at least part of the course)
- Price
- $40 to $100 plus the platform's processing fee
- Next price increase
- None published
- Registration
- Open. Opened February 17, online signup closes Thursday, October 29, 2026
How to register
Registration is on RunSignup. Pick your distance, add any extras, and you'll get a confirmation email with your bib details.
Register on RunSignup →Race website
Course and race notes
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.
From the race's own listing. Check the race website for the course map and parking.
Source: RunSignup public race API, refreshed 2026-10-17. Details can change; the registration page is the final word.