Saturday, October 10, 2026 · 8:00 AM · Indianapolis, Indiana
The Big BO 50k
Stay Obsessed. and the B&O Trail Association are proud to welcome you to the First Annual Big BO 50K Ultramarathon
Join your fellow run obsessed friends on the newly completed B&O Trail for a fast, exciting 50K experience unlike any other in central Indiana.
The journey begins at Daredevil Brewing Co. in the heart of Speedway — the Racing Capital of the World — and covers the entire length of the B&O trail through Marion and Hendricks County. You’ll Head east toward downtown Indy for a few miles before turning around head out to rural Hendricks County before making the return trip back to Speedway.
This course is flat, fast, and built for big goals. Whether you're dipping your toes into the world of ultrarunning for the first time or chasing a shiny new 50K PR, the Big BO 50K delivers the perfect stage to test your limits.
Stay Active. Stay Healthy. Stay obsessed.
- Time limit
- No time limit listed by the organizer
- Walkers
- Not mentioned — ask the organizer
- Terrain
- flat and fast
- Certified
- Not stated
Pulled from the organizer's own race description — per the organizer, not independently verified.
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Source
Race details on this page come from RunSignup.
Race details can change and mistakes can be made. Always verify the race website for the most complete and accurate information. Report an error on this page.
Doability details — walkers welcome, time limit, terrain, and course certification — are read from the organizer's own description and haven't been independently verified.
Are you the race organizer, or did you spot something wrong?
The Big BO 50k
Oct 10, 2026 · $33.15-$86.15