Cougar Mountain Trail Run Series
Bellevue, United States • 9 May 2026
Event details
The Cougar Mountain Trail Run Series (May) takes place on May 9, 2026 at Sky Country Trailhead, 7077 Clay Pit Road, Bellevue, WA 98006. The series is organized by Seattle Running Club and Northwest Trail Runs. For the May event the listed entry options are:
- 5.1 miles : $50 race fee (+ $4.00 signup fee)
- 10.8 miles : $60 race fee (+ $4.60 signup fee)
- Short Series pass (May, June, July, August) : $180 (+ $11.80 signup fee)
- Long Series pass (May, June, July, August) : $225 (+ $14.50 signup fee)
Online registration for these May entries opens February 10, 2026 and the May registration window ends May 6, 2026. A portion of each entry fee - $15 per runner - is donated to King County Parks. There is a participant cap and the event policy states there are no refunds.
Course, format and policies
Races use single-track trails through Cougar Mountain Regional Wildland Park, including fern-lined paths, marsh and wetland sections, rolling hills, some moderate climbs, and a few steep short inclines. The summer series runs on the second Saturday of May, June, July and August; fall races are on the last Sunday in October. Series awards use each competitor’s best three of four races; top overall Man, Woman, and Nonbinary cumulative-time winners receive awards and free entry next year. The event is cup-free; participants are asked to bring a refillable water container for aid stations. Dogs are not allowed on the course due to insurance requirements. Photos may be taken and used by the organizer. Visit the organization's website for the most recent information.