Race Discovery
The Big BO 50k
The Big BO 50k logo

The Big BO 50k

Indianapolis, Indiana, United States
Oct 10, 2026
Running

About this race

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.

Pick your distance

Running

50k

4:00 PM Cutoff Time.

Oct 10, 2026 Ultra 8:00 AM
$80.00
Open

25k

Oct 10, 2026 25K 8:00 AM
$60.00
Open

10k

Oct 10, 2026 10K 9:00 AM
$40.00
Open

5k

Oct 10, 2026 5K 9:00 AM
$30.00
Open

Weather Overview

These values represent the 4-year monthly averages for October in Indianapolis.

Temp (°C)
Minimum temperature (monthly average) 11.5° / Maximum temperature (monthly average) 22.1°
Feels Like (°C)
Minimum feels like (with wind chill; monthly average) 11.5° / Maximum feels like (with wind chill; monthly average) 22.1°
Wind (km/h)
Average wind speed (monthly average)
14.1
Precipitation (mm)
Average precipitation (monthly average)
0.1mm

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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