Cougar Mountain Trail Run Series
Bellevue, United States • 9 May 2026
Cougar Mountain Trail Run Series (May)
The May installment of the Cougar Mountain Trail Run Series takes place at the Sky Country Trailhead within Cougar Mountain Regional Wildland Park in Bellevue, Washington. This event is organized by the Seattle Running Club and Northwest Trail Runs, with a portion of every entry fee donated to King County Parks for land stewardship. The course follows single-track trails through lush forests, marshes, and wetland habitats.
The May event features two primary distances:
- 5.1 Miles
- 10.8 Miles
Participants may register for individual races or sign up for the full summer series. The Short Series includes distances of 5.1, 8.2, 10.8, and 14.5 miles held from May through August. The Long Series consists of 10.8, 14.5, 19.5, and 26.2 miles. Runners who participate in at least three out of the four summer races are eligible for series awards.
The trails at Cougar Mountain consist of rolling hills with some moderate climbs and short, steep inclines. This race is a cup-free event; participants are required to bring their own refillable water containers for use at aid stations to reduce waste. For safety and insurance reasons, dogs are not permitted on the course. Post-race food and refreshments are provided for participants at the finish area. Awards are presented to the top three finishers in the men, women, and nonbinary categories for each distance. Visit the organization's website for the most recent information.