Tecumseh Trail Challenge
Oct 17Nashville, IN50K, Marathon +2
Also 50K, 39 mi from The Big BO 50k, registration open
50K25K10K5KRegistration open
The Big BO 50k
Indianapolis, Indiana
- Entry from
- $40
- Days to go
- 4
At a glance
- Date
- Oct 10, 2026
- Location
- Indianapolis, Indiana
- Distances
- 50K, 25K, 10K, 5K
- Registration
- Registration open until Oct 10, 2026, via runsignup.com
- Official site
- runsignup.com
- Listed from
- RunSignUp
- Last checked
- Oct 5, 2026
Plan this race for free
Aid stations, cutoffs and pacing in one plan, with the timeline your crew follows. Crew invites and race-day updates come with a Race Pass.
Build my planAbout this race
**PLEASE NOTE IF YOU REGISTER AFTER 9/22, WE CANNOT GURANTEE MEDAL OR SHIRT**
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.
Key dates
Registration opens
Mar 6, 2026
Tier 1 ends
May 31, 2026
Tier 2 ends
Aug 30, 2026
Tier 3 ends
Sep 27, 2026
Registration closes
Oct 10, 2026
Race day
Oct 10, 2026
Tier 4 ends
Oct 10, 2026
Pricing
50k
Tier 4, until Oct 10, 2026
$90
25k
Tier 4, until Oct 10, 2026
$70
10k
Tier 4, until Oct 10, 2026
$48
5k
Tier 4, until Oct 10, 2026
$40
Email me updates about The Big BO 50k
Registration openings and major changes, like a new date or a cancellation.
Entry transfers
Can't race, or need an entry? Post it here so nobody has to ask if it's still available.
Similar races
Heritage 50k & Half-Marathon
Oct 11Adrian, MI50K, Half Marathon
Also 50K, similar trail technicality to The Big BO 50k, registration open
Jackson County Ultras
Oct 31Brownstown, IN100K, 50K +1
Also 50K, 62 mi from The Big BO 50k, registration open
Another Dam 50k & 25k
Oct 18Englewood, OH50K, 25K
Also 50K, 99 mi from The Big BO 50k, registration open
Straight-line distance
More 50K Races in Indiana
All 50K Races in IndianaTecumseh Trail Challenge
Oct 17Nashville, IN50K, Marathon +2
New Hope Wesleyan Ultra Trail Run
Oct 24Corydon, IN50K, Half Marathon +2
Jackson County Ultras
Oct 31Brownstown, IN100K, 50K +1
OPSF5050
Mar 20, 2027Poland, IN50 mi, 50K +2
The Full Mo
Jun 5, 2027Sheridan, IN50K
Races Near Indianapolis
All races near IndianapolisTurkey Trails- Indianapolis
Nov 8Indianapolis, INHalf Marathon, 10K +2
Hustle in the Heartland 8hr Run/Walk
Oct 10Lebanon, IN8 hr
Wildmere Mile
Jul 24, 2027Gosport, IN
OUTLAST INDIANAPOLIS
Oct 17Columbus, IN36 mi, 18 mi
Bloomington Montessori 2025 Fall Fun Run 5K Trail Race and Family Fun Run
Oct 24Bloomington, IN5K, 1.5 mi +1
Grind on the Grid Backyard Ultra
Apr 17, 2027Wingate, INBackyard Ultra
Camp Challenge 5k Trail Run
Oct 10Bedford, IN
October Races Nearby
All October racesDouble Days 48 Hour Race
Oct 9West Alexandria, OH48 hr, 24 hr +3
Indiana Trail 100
Oct 9Albion, IN150 mi, 100 mi +1
Sandhill Crane All Trail Half Marathon/10K/5K
Oct 10Vandalia, MIHalf Marathon, 10K +1
Scouting's Meecheway 5K Trail Run - COLOR RUN VOL. 3 2026
Oct 10Defiance, OH5K
Tails on the Trail
Oct 10Cincinnati, OH5K, 1 mi
Race planning
Plan The Big BO 50k with Crewable
Build your aid station plan, organize your crew, and dial in your nutrition strategy. Everything you need to finish strong.
Build my planAre you the race director for The Big BO 50k?
Claim this race to manage registration, volunteers, and race day.