The Geist Half Marathon, 10K & 5K, returns for its 17th year on Saturday, September 13, 2025! Operated by the City of Fishers in partnership with Vision Events Management, the race showcases the beauty of Geist Reservoir with stunning water views, tree covered trails, and waterfront bridges.

The Geist Half Marathon race series offers a 5K (3.1 miles), 10K (6.2 miles), and a Half Marathon (21.0975km or 13.1 miles). The Half Marathon and 10K races will begin promptly at 7:30a.m. followed shortly by the 5K to start at approximately 7:45a.m.

Geist Half Marathon is locally known for its challenging course with hills around every corner, and bridges featuring some of Indiana’s most scenic views. All participants receive a race shirt, medal, timing bib, and access to the post-race party. VIP registration is also available.