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Cougar Mountain Trail Run Series

Bellevue, United States • 25 Oct 2025

Cougar Mountain Trail Run Series, held near Seattle in King County’s Cougar Mountain Regional Wildland Park in Newcastle, WA, offers four distances: 5K, 7.6 miles, 19.5 miles, and 50K. The course features rolling hills through a lush forest, fern-lined single-track, and marshy sections, with a mix of technical and groomed trails just minutes from the city. Organized by the Seattle Running Club and Northwest Trail Runs, the series supports King County Parks and emphasizes community, post-race camaraderie, and Cup-Free environmental practices. October races include a costume contest and Cougar Cup team format; select events host USATF championships and youth championships with prize money. Visit the organization's website for the most recent information.

United States Washington Bellevue

Race information

Website
50 km
7200 m+
50-Km
20 mi
3700 m+
19.5-Mi
8 mi
1150 m+
7.6-Mi
5 km
107 m+
Visit the organization's website for the most recent information.
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