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Ultras · US · Tennessee

Big's Backyard Ultra

2027 Big Dog's Backyard Ultra – Individual World Championship
On the calendar
The date is set. Entry has not opened. Places are earned through national championships and the At-Large list.
Race dateOctober 16, 2027
Whenin 365 days
First held2011

Who's going to Big's Backyard Ultra?

Free. You can start with nothing.

Free, and always will be. NavRun makes money from race-day planning for runners who want it, never from this. Ultras change constantly, sometimes the morning of. Always confirm with the race director and the official website before you rely on anything here.
Distance The Yard – Individual World Championship
Climb not checked yet
Descent not checked yet
High point not checked yet
Time limit does not apply to this race
Aid stations 0
Started not checked yet
The course

Where it goes backyard

The race

What this one is

The original backyard ultra: a 4.1667-mile loop run every hour, on the hour, until only one competitor can complete a lap that everyone else fails to match. Every other finisher is recorded as a DNF, however far they went.

Invented in 2011 by Gary "Lazarus Lake" Cantrell on his property in the Short Creek community near Bell Buckle, Tennessee, this race originated the backyard ultra format and has run every October since, except 2015 when it was not held. In 2020, COVID-19 travel restrictions replaced the single Tennessee race with simultaneous satellite national championships; the event has continued in that expanded shape, now alternating each year between a World Individual Championship (run at the original Bell Buckle farm) and a World Team Championship (run as simultaneous races in each competing country, compared by combined team mileage). Harvey Lewis set the men's world record of 108 laps here in 2023; Phil Gore broke it with 114 laps in 2025; Sarah Perry set the current women's world record of 95 laps at the same 2025 race.

Getting in

Getting in Entry, lottery and what the race asks of you before race day.

Lottery
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Lottery opens
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Lottery draw
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Field cap
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Registration
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Qualifying
The top 50 winners of the national championships secure berths at the World Individual Championships. In addition to those champions, 25 runners are selected from the At-Large list, the top performances of the previous 2 year qualifying period (August 16, 2025 to August 15, 2027). bigsbackyardultra.com
Minimum age
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Transfers
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Deferrals
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Crew access, pacers and drop bags

The rules that shape your day Anything marked "not checked yet" is a gap in what we hold, never a no from the race.

Crew allowed
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Vehicles per runner
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Pacers
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Muling
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Drop bags
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Cupless
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Course marking
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Night running
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Dogs
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Headphones
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Crew rules
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Pacer rules
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Drop bag rules
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Cutoff philosophy
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Same race, other lines

Other distances and other years

Other years
2025
What it looks like out there

Somebody has been out there with a camera the tables say the climb is long. these say what long feels like.

Add to this page

What you know every one of these is read by a person before it changes anything

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Copy it as it appears, so we can find it.

The corrected value.

Required. Where it came from: the race email, the runner manual, what you saw on the day.

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Optional, only so we can come back to you about this correction.

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Seen a course preview or a film of this one? Send it over.

Somebody watches it before it goes anywhere near this page. What we are after is footage of this course, on the ground. If it would be just as true of any other race, it is not this.

Required. A line is plenty. Where the climbs are, what the footing does, what the last twenty miles look like.

Optional, and it decides nothing.

Optional.

Optional, and never shown on the page. Only so we can ask you a question about this one.

A YouTube link, a race report, a photo gallery, whatever it is.

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Have the GPX? Send us the link.

We want the address of the file the race publishes, not the file. We download it from there so the page can say where the line came from.

The page or file on the race's own site.

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Are you the race director? Get in touch and we'll make it right.

We read every one of these and we write back. Every fact here carries the source it came from, and the way a wrong one gets fixed is a person checking it against what you tell us.

Required, because this is a conversation and we write back.

Tell us what is wrong, out of date, or missing on this page. We read every one of these and we will get back to you.

Optional.

So we know who we are writing back to.

Optional. Director, assistant, comms, whoever you are.

Leave this field blank.

Where this came from. Every fact on this page records its source and when we last checked it: 16 sources for this race. Hover a source link to read the sentence it came from.
7% of what we track for a course is filled in. The rest says "not checked yet" rather than guessing.
See something wrong or out of date? Suggest an edit
Ran this race? Tell the next runner what you know
Got footage of this course? Send us the link
Are you the race director? Get in touch and we'll make it right.
Anything else: [email protected]

Ultras change. We will tell you when this one does.

Cutoffs move, races get postponed, lotteries open and close. We read the race's own sources and record where every fact came from. Put your email in and we will send you what changed, and where we read it.

No account, and nothing to cancel.

What happens to your email. Nothing else. I do not sell it, and I will not send you anything except this race changing. One click gets you out.

I keep this catalog because the information is scattered and hard to trust. Telling you when it moves is the same job.

Ultras change. We will tell you when this one does.

Cutoffs move, races get postponed, lotteries open and close. We read the race's own sources and record where every fact came from. Put your email in and we will send you what changed, and where we read it.

No account, and nothing to cancel.

What happens to your email. Nothing else. I do not sell it, and I will not send you anything except this race changing. One click gets you out.

I keep this catalog because the information is scattered and hard to trust. Telling you when it moves is the same job.