Get ready to tackle a gorgeous downhill marathon through Washington's countryside on September 19, 2026—this Boston Qualifier-friendly course starts at Mud Mountain Dam and descends 1,200 feet along the Carbon River through farmland and forests, finishing at the historic McMillin Bridge with completely paved roads and zero excuses! If a full marathon feels like too much, the half marathon kicks off in South Prairie and offers the same scenic downhill experience on a smaller scale. Mark your calendars and start training for what's sure to be an amazing fall running adventure!