The Big BO 50k
About the Event
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.
Join fellow runners on October 10, 2026 for the The Big BO 50k. It's a fantastic Ultra, 25K, 10K, 5K featuring a flat and fast course in Indianapolis.
Races Offered
Running
50k
4:00 PM Cutoff Time.
25k
10k
5k
Weather Overview
These values represent the 3-year monthly averages for October in Indianapolis.
About Indianapolis
The Big BO 50k takes place in Indianapolis, Indiana, United States. The local timezone is America/Indiana/Indianapolis.
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Race information has been sourced from the event's official website and other publicly available resources. For the most up-to-date details, please refer to the official website directly. If you notice any incorrect or missing information, don't hesitate to reach out to us by email.
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