Cougar Mountain Trail Run Series (June)

Embark on a captivating trail adventure at the Cougar Mountain Trail Run Series (June) on June 13, 2026, nestled in the verdant landscapes of Bellevue, WA. Runners can choose their challenge from three distances: a speedy 3.1M (5K), a spirited 8.2M, or a demanding 14.5M. This esteemed event, part of a series running since 2003, is renowned for its well-marked, lush forest trails within the popular Cougar Mountain Regional Wildland Park, offering a mix of fern-lined single-track and wider groomed paths. Expect a dynamic course featuring rolling hills, moderate climbs, and a few steep but short inclines, traversing diverse habitats including marshes and wetlands. While panoramic vistas are subtle, the intrinsic beauty of running through the serene forest provides its own reward.

The Cougar Mountain Trail Run Series is more than just a race; it's a community-driven event supporting King County Parks, having contributed over $265,000 and countless hours of trail work. Known for its organized execution by the Seattle Running Club and Northwest Trail Runs, this cup-free race encourages runners to bring their own refillable water containers, promoting a greener experience at well-supported aid stations. Located just 15 minutes from Seattle, starting at the Sky Country Trailhead, it serves as an ideal training ground for fall marathons and ultras or simply a superb opportunity to enjoy an energetic, local trail race. Typical race day conditions in June offer pleasant highs around 70°F and lows around 52°F, with only a 6% chance of precipitation, promising comfortable running weather.