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The Big BO 50k

Name: The Big BO 50k
Start: 2026-10-10
End: 2026-10-10
Location: Indianapolis

Indianapolis, Indiana, United States

calendar_today 10 Oct, 2026

directions_run Running

language Official Website

sell $25.00 – $75.00

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.

Medals guaranteed for first 150.

Stay Active. Stay Healthy. Stay obsessed.

Races Offered

50k

Oct 10, 2026

straighten

Distance — 50K

terrain

Type — Running

timer

07:00

sell

$75.00

10k

Oct 10, 2026

straighten

Distance — 10K

terrain

Type — Running

timer

09:00

sell

$35.00

25k

Oct 10, 2026

straighten

Distance — 25K

terrain

Type — Running

timer

09:00

sell

$55.00

5k

Oct 10, 2026

straighten

Distance — 5K

terrain

Type — Running

timer

09:00

sell

$25.00

Weather History

These values represent the 3-year monthly averages for October in Indianapolis.

thermostat Temperature

9.3° / 20.0°

wb_sunny Feels like

6.6° / 17.3°

light_mode Avg sunshine hours

8h 40m

water_drop Avg rainfall

1.7 mm

ac_unit Avg snowfall

—

air Avg wind speed

11.3 km/h (Light breeze)

opacity Sweat loss rate

Low

terrain Course conditions

Firm and slightly soft

sunny Max UV Index

Moderate (4.0)

humidity_mid Humidity

65.4%

wb_twilight Sunrise

07:55

nightlight Sunset

19:03

About Indianapolis

Learn more about the host city, Indianapolis.

Indianapolis, colloquially known as Indy, is the capital and most populous city of the U.S. state of Indiana and the county seat of Marion County. Indianapolis is situated in the state's central till plain region along the west fork of the White River. The city's official slogan, "Crossroads of America", reflects its historic importance as a transportation hub and its relative proximity to other major North American markets.