Head to Sunday River on July 26, 2026, for this kid-friendly obstacle course event featuring up to 500 young participants ages 4-12 tackling a scaled-down version of the Tough Mountain Challenge. Expect a shorter course with uphill and downhill running, mud, dirt obstacles, snow guns, ball pits, foam finishes, and select adult-style challenges—all designed to be fun and get kids dirty! Races are organized by age groups, with course length and obstacles tailored accordingly, all taking place at the same venue as the full Tough Mountain event.