The Big BO 50k
- Date
- October 10, 2026
- Distance
- 5K · 10K · Ultra · Other
- Price
- $30–$80
From the Organizer
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.
Events
Weather
Typical Conditions
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
68°
Typical Low
48°
Chance of Rain
32%
Based on US Climate Normals data from Indianapolis Eagle Creek Ap, 3 mi from the venue.
Host City
About Indianapolis, IN
Population
882,043
as of 2023
City Elevation
728 ft
Nearest Airport
IND
Indianapolis International Airport · 10 mi
Time Zone
Eastern Time
From Endurance Grid
A big city race. Expect multiple lodging options and plenty to do the day before.
Your Next Start Line
What Are You
Waiting For?
Every finish line starts with a single decision. Claim your spot at The Big BO 50k, put it on the calendar, and turn “someday” into a start date.
115
Days to train
- Race
- The Big BO 50k
- Date
- October 10, 2026
Coming Up
More Running races near Indianapolis, IN
100 Holes for the Homeless
Eagle Creek Golf Club
3 miles away
Indiana Sports Corp Corporate Challenge 5K and 10K (Non-affiliated)
5K · 10K · From $10 · 4790 West 16th St.
2 miles away
Indiana Sports Corp Corporate Challenge 2026
4790 West 16th St.
2 miles away
Gateway Gallop 5k
5K · From $35.99 · Ben Davis High School
Less than a mile away
From Endurance Grid
About This Sport
Endurance Grid is here to help you understand the sport, decide if it’s the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer’s event page.
With running, there's a distance for every fitness level, a community at every start line, and nothing beats the feeling of crossing a finish line you trained for.
Running is an endurance sport that rewards consistency, and showing up every week compounds in ways that will surprise you.
Running
From 5K to marathon, running races are the most accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Frequently Asked Questions (FAQs)
- What is The Big BO 50k?
- The Big BO 50k is a running race held in Indianapolis, Indiana on October 10, 2026. It is one of the many endurance events listed on Endurance Grid, a multi-sport endurance event calendar covering running races, triathlons, HYROX, and more endurance sports across the United States. Find more running races near you or explore our sports guides to learn what race day actually feels like.
- When and where is The Big BO 50k?
- Saturday, October 10, 2026 in Indianapolis, Indiana at Daredevil Brewing Co.. Check the event page for exact start times and wave schedules.
- How do I register for The Big BO 50k?
- Registration is handled through the event's registration page. Confirm pricing and distances there, and sign up.
The Big BO 50k
Oct 10, 2026