John Bryan Arboretum Trail Half Marathon & Challenge 2026

The John Bryan Arboretum Trail Half Marathon & Challenge is a loop-based trail event held at John Bryan State Park Arboretum in Yellow Springs, Ohio. Rather than a single long route, the event utilizes a 1.1-mile loop, allowing runners to select their desired number of laps, ranging from one lap to the 13.2-mile half marathon distance. The available distances are 1.1 miles, 3.3 miles, 6.6 miles, 9.9 miles, and 13.2 miles, with each increment representing additional loops of the same trail circuit. Aid stations are positioned every 1.1 miles, park restrooms are accessible, and the repetitive loop design simplifies navigation for participants while offering spectators frequent viewing opportunities.