The Big BO 50K
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About the race
The Big BO 50K takes place on 10/10/2026 and is based at Daredevil Brewing Co., 1151 N Main St., Speedway, Indianapolis, IN. The event is organized by Stay Obsessed and the B&O Trail Association as the first annual Big BO 50K ultramarathon with supporting shorter races.
Races use the newly completed B&O Trail and cover the trail through Marion and Hendricks County. The route heads east toward downtown Indianapolis for a few miles, then turns back toward rural Hendricks County and returns to Speedway. The course is flat.
Distances and registration details:
- 50K - fee $75; registration Mar 6 to May 31, 2026
- 25K - fee $55; registration Mar 6 to May 31, 2026
- 10K - fee $35; registration May 20 to May 31, 2026
- 5K - fee $25; registration Mar 6 to May 31, 2026
Registrations submitted after September 22 are not guaranteed a medal or shirt. Start times and cutoff times are not included here. Visit the organization's website for the most recent information.
