Join Seattle Running Club and Northwest Trail Runs for the 2026 Cougar Mountain Trail Run Series, a multi-event trail running experience throughout the year with distances ranging from 5K to 50K. All races kick off in the morning, and $15 from each entry supports King County Parks. The July 11 event features three distance options—5K, 10.8 miles, and 19.5 miles—with a 2:30 PM cutoff time.