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Ultras · US · FL

Cow Ford 100 / 50 Miler

100 Miler · 100 Mile
Registration open
Registration is open.
Race dateMarch 20, 2027
Start7:00am
Whenin 147 days

Who's going to Cow Ford 100 / 50 Miler?

I'm running itPlan your weeks and your aid station times I'm crewingWhen to leave, where to park, at every stop I'm pacing or cheeringAsk your runner for their Out Here link

Free. You can start with nothing.

Official website Entry Notify me if this race changes
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 From the name
100 Mile The race calls this course “100 Miler” and hasn't published a measured distance. Trail courses often run long.
Climb
not checked yet
Descent
not checked yet
High point
not checked yet
Time limit The race
36:00:00
Aid stations
0
Started
not checked yet
Finished
not checked yet
Finish rate
not checked yet
The course

Where it goes

Course line from the race's own GPX. Source file. Recorded 2026.

Runners do the five-segment Jacksonville course twice. After the first loop they run the course in reverse, with a slight adjustment on the way back.

Generally flat, with notable bridge climbs. There are no street closures or police presence along the route, so runners obey traffic laws and cross only at crosswalks and lights. One stretch in Ortega has no sidewalk or shoulder; runners use the edge of the road or the grass beside it.

The race

What this one is

An urban ultramarathon through Jacksonville, Florida, in five sequential segments from historic neighborhoods to a finish in the urban core. The route follows paved roads, shared-use paths, bridges and greenways, with no street closures. Runners choose the 50 miler or the 100 miler, which runs the course twice.

Getting in

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

Lottery
not checked yet
Lottery opens
not checked yet
Lottery draw
not checked yet
Field cap
not checked yet
Registration
UltraSignup ultrasignup.com
Qualifying
not checked yet
Minimum age
not checked yet
Transfers
not checked yet
Deferrals
not checked yet
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
Yes ultrasignup.com
Vehicles per runner
1 ultrasignup.com
Pacers
not checked yet
Muling
not checked yet
Drop bags
not checked yet
Cupless
not checked yet
Course marking
GPX Required ultrasignup.com
Night running
Yes ultrasignup.com
Dogs
not checked yet
Headphones
not checked yet
Crew rules
Crew can help runners only in designated areas. Every crew vehicle must be marked, and each runner may have only one crew vehicle. ultrasignup.com
Pacer rules
not checked yet
Drop bag rules
not checked yet
Cutoff philosophy
The 100 miler has a 36 hour limit. A runner who cannot finish tells someone at an aid station or calls or texts the race director. The race will try to help with a ride to the finish area but cannot guarantee one. ultrasignup.com
Same race, other lines

Other distances and other years

Other distances
50 Miler (51.24 miles)
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.

Nobody has been out there with a camera or a microphone yet. A gap means nobody has found it, not that it is not out there. Seen a course preview or a film of this one? Send us the link.

Add to this page

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

Ran this race? Tell the next runner what you know.

Nobody sees it until we have read it. No account, no sign-in.

Leave blank if it applies to the whole race.

Leave blank if it is not about one particular stop.

Optional. Something like “Cal Street, mile 62 to 78”.

Write it the way you would say it to someone at the start line.

Optional, and it decides nothing. It only tells the next runner where this is coming from.

Optional.

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

Leave this field blank.

See something wrong or out of date? Suggest an edit.

This changes nothing on the page on its own. Somebody checks it against the race first.

Optional. Filled in for you when you start from a specific line on the page.

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.

Optional.

Optional. A screenshot or a photo of the sign works.

Optional, and it decides nothing.

Optional.

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

Leave blank if it is about the whole race.

Leave blank if it is not about one particular stop.

Leave this field blank.

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.

Optional, and we credit them on the page.

Leave this field blank.

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.

Optional, and only so we can ask you a question about it.

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: 37 sources for this race. Hover a source link to read the sentence it came from.
29% 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
Were you out there? Say which stops a text got out from
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.