The Big BO 50k
Oct 10Indianapolis, IN50K, 25K +2
Also 50K, similar trail technicality to Heritage 50k & Half-Marathon, registration open
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 planHeritage 50K & Half Marathon
A Tradition Returns. Bigger. Better. Ready to Make History.
The Heritage 50K & Half Marathon is back, and we're bringing new energy to one of Lenawee County's signature endurance events.
Whether you're chasing your first half marathon finish or taking on the challenge of 50 kilometers, this event is designed to test your limits while celebrating the endurance community that continues to grow throughout southeast Michigan.
Set against the scenic backdrop of Heritage Park, runners will experience well-maintained trails, rolling terrain, supportive volunteers, fully stocked aid stations, and an atmosphere that encourages every participant—from first-time racers to seasoned ultramarathon veterans.
This isn't just another race. It's an opportunity to become part of a tradition built on perseverance, community, and the belief that ordinary people are capable of extraordinary things.
Half Marathon
Perfect for runners looking to challenge themselves on a unique course while enjoying an encouraging race-day experience.
50K Ultramarathon
Thirty-one miles of grit, determination, and unforgettable accomplishment. Push your boundaries alongside an incredible community of endurance athletes and discover what you're truly capable of.
What to Expect
Professionally managed course
Fully stocked aid stations
Custom finisher medal
Premium race shirt
Overall awards
Friendly volunteers and enthusiastic community support
Post-race refreshments and celebration
Whether you're racing for a personal best, your first finish line, or simply the adventure, the Heritage 50K & Half Marathon promises a memorable experience from start to finish.
Join us as we write the next chapter of the Heritage tradition. Every mile tells a story. Make this year's story yours.
Registration opens
Jul 8, 2026
Tier 1 ends
Jul 31, 2026
Tier 2 ends
Aug 31, 2026
Tier 3 ends
Sep 30, 2026
Registration closes
Oct 11, 2026
Race day
Oct 11, 2026
Tier 4 ends
Oct 11, 2026
50k Ultra Marathon
Tier 4, until Oct 11, 2026
$125
Half Marathon
Tier 4, until Oct 11, 2026
$90
Registration openings and major changes, like a new date or a cancellation.
Can't race, or need an entry? Post it here so nobody has to ask if it's still available.
Oct 10Indianapolis, IN50K, 25K +2
Also 50K, similar trail technicality to Heritage 50k & Half-Marathon, registration open
Oct 18Englewood, OH50K, 25K
Also 50K, 140 mi from Heritage 50k & Half-Marathon, registration open
Oct 17Millston, WI85K, 50K +2
Also 50K, similar trail technicality to Heritage 50k & Half-Marathon, registration open
Nov 1Lewis Center, OH50K, 20K +1
Also 50K, 129 mi from Heritage 50k & Half-Marathon, registration open
Straight-line distance
Oct 10Petoskey, MI100 mi, 100K +1
Nov 7Houghton, MI50K, 25K
Jan 2, 2027Middleville, MI50K, 25K +2
Oct 17Lucas, OH12 hr
Jun 12, 2027Grass Lake, MI100 mi, 50 mi
Nov 7Canton, MI22 hr
Oct 17Brighton, MI25K, 18K +1
Oct 10Defiance, OH5K
Nov 1Howell, MI3.2 mi
Oct 17Holt, MI5K
Nov 1Lansing, MI5K
Oct 10Clarkston, MI
Jan 16, 2027Holly, MI8 hr, 10K +2
Jul 17, 2027Holly, MIBackyard Ultra, 3 hr
May 22, 2027Clarkston, MIBackyard Ultra, 3 hr
Oct 9Albion, IN150 mi, 100 mi +1
Oct 10Holland, MI5K
Oct 10Akron, OH100 mi, 50 mi
Oct 10Northfield, OH1 mi
Oct 10Perrysville, OHMarathon, Half Marathon +1
Oct 10Vandalia, MIHalf Marathon, 10K +1
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 Heritage 50k & Half-Marathon?
Claim this race to manage registration, volunteers, and race day.