Trillium Trail Run

Running Up For Air - Tiger Mountain is an endurance running event taking place in Issaquah, Washington, designed to raise awareness about air quality issues. Participants can choose from various challenges, including 12-hour, 6-hour, and 3-hour races, all set against the stunning backdrop of Tiger M..

Tiger Claw is an exhilarating trail running event taking place in Issaquah, WA, featuring challenging courses that test the limits of even the most seasoned runners. Participants can choose from three different climbs and a common descent, with the option to complete the 50k or the more demanding 50..

The Cougar Mountain Trail Run Series, organized by the Seattle Running Club and Northwest Trail Runs, features a variety of trail running events in King County's Cougar Mountain Regional Wildland Park. Scheduled for May 10, 2025, participants can choose between a 5.1-mile and a 10.8-mile race. This..

The Dirty Turtle 25/50K is an exciting trail running event set in Bremerton, WA, featuring challenging courses that include 75% singletrack and 25% dirt/gravel service roads. Participants can choose between a 25K or 50K distance, with the latter offering a demanding elevation gain of 7,000 to 8,000..

The Sri Chinmoy 13 Hour Ultra is a unique running event that features timed loop races designed to enhance planning, pacing, and endurance. Participants can choose from solo or relay formats, with a scenic 1.54-mile loop course offering views of Lake Washington. The event fosters a supportive and ch..

The Pigtails Challenge is an endurance running event held at Lake Youngs Watershed, featuring a rolling loop course with 900 feet of elevation gain per loop. Participants can choose from various distances, including 200 miles, 150 miles, 100 miles, 100 kilometers, and 50 kilometers. The event is des..