Cougar Mountain Trail Run Series

The Cougar Mountain Trail Run Series, held in Bellevue, Washington, is a popular annual trail running event hosted by Seattle Running Club and Northwest Trail Runs. The August 2025 race offers three distances: 5K, 14.5 miles, and a full marathon of 26.2 miles, all set within King County’s Cougar Mountain Regional Wildland Park, just 15 minutes from Seattle. The course features lush forests, fern-lined single-track trails, rolling hills, moderate climbs, and wetland habitats, suitable for all experience levels.

The series supports King County Parks, donating $15 per entry, and includes community-focused features like post-race food, beverages, and youth trail running championships. The event emphasizes sustainability and safety, with no dogs allowed on the course. Visit the organization's website for the most recent information.