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Ultras · US · TX

Dinosaur Valley Endurance Run

Cretaceous 25K · 25K
Registration open
Race dateNovember 22, 2026
Start8:00am
Whenin 37 days
First held2017

Who's going to Dinosaur Valley Endurance Run?

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 25K
Climb not checked yet
Descent not checked yet
High point not checked yet
Time limit not checked yet
Aid stations 0
Started not checked yet
Finished not checked yet
Finish rate not checked yet
The course

Where it goes multi-loop

The 5 mile loop first, then one 10.5-mile loop, out of Valley Village. Each day's 25K is its own event with its own awards.

Rolling and sustained ascents and descents, none terribly steep. Double track in fields, single track in wooded areas, with packed dirt, smaller and larger rocks, slick rock and some roots. There are no river crossings.

The race

What this one is

Held at Dinosaur Valley State Park in Glen Rose, Texas, on a looped course of rolling and sustained ascents and descents, none terribly steep. Distances are 5 mile, 25K, 50K, 100K and 100 mile, with a Western States qualifier in the 100K and the 100 mile. The 5 mile and 25K run on more than one day, and Saturday night has a 5 mile start.

First run in 2017. The Active Joe brought North Texas its first 100 miler here. The current course has been used each year beginning with 2018.

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
Yes theactivejoe.com
Deferrals
No theactivejoe.com
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 theactivejoe.com
Vehicles per runner
not checked yet
Pacers
not checked yet
Muling
not checked yet
Drop bags
not checked yet
Cupless
Yes theactivejoe.com
Course marking
Fully Marked theactivejoe.com
Night running
not checked yet
Dogs
Not allowed theactivejoe.com
Headphones
not checked yet
Crew rules
Crewing is allowed only at Valley Village (Cedar Brake Aid Station), about a 0.75 mile walk in from race parking. No crewing at the Fence Line Aid Station unless your crew is volunteering there. Crews cannot drink or eat aid station foods. All gear must be removed by Sunday, 6 PM. theactivejoe.com
Pacer rules
Participants ages 70+ may have a pacer from the start of the race to the finish with permission ahead of time by the Race Director (email to get approved). Participants under age 70 may not have a pacer. theactivejoe.com
Drop bag rules
not checked yet
Cutoff philosophy
The pace requirements are very hiker-friendly. The chart gives the cutoff for your final loop. theactivejoe.com
Same race, other lines

Other distances and other years

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.

4 people have been out there with a camera or a microphone.

These are other people's work and we link straight to them. Watching costs nothing and needs no account. More of them: every race we hold, on film.

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: 47 sources for this race. Hover a source link to read the sentence it came from.
25% 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.