Is crew access allowed on the 100 Miler course?

Yes, crew access is allowed on the 100 Miler course. Crews are welcome near the start/finish at the Competitive Track ("Rumble Headquarters"). Canopies are welcome along the course where runners come through every lap. Crews are also allowed at Horse Thief Aid, but structures cannot be set up and there is no camping.

Are drop bags allowed on the 100 Miler course?

Yes, drop bags are allowed on the 100 Miler course. A drop bag at Rumble HQ (start/finish) for all distances. 100 Mile, 100K and 60K runners may also have a remote drop bag at Horse Thief Aid. There is no set timeline for drop bags returning to Rumble HQ.

Are pacers allowed on the 100 Miler course?

Yes, pacers are allowed on the 100 Miler course. A pacer may join starting at mile 47.1. Pacers may join after mile 47.1 (last two Blue Loops) and can enter or exit at Rumble HQ and Horse Thief Aid. One pacer per runner at a time. Pacers must be human and on foot. No shuttles for pacers. Pacers need no bib and need not sign in or out.

What is the cutoff time for the 100 Miler course?

The overall time limit for the 100 Miler course is 32 hours from the start. Mid-race cutoffs are for leaving aid stations, not arriving. Hard cutoffs: clear the second Red Loop by 1:30pm Saturday, start the final Blue Loop by 6:30am Sunday, leave Horse Thief Aid by 12:30pm Sunday, final cutoff 3:00pm Sunday. Soft cutoffs at Rainbow Valley (9:15am) and Pedersen (10:00am) may be enforced at RD discretion.

Ultras · US · AZ

Coldwater Hundred

100 Miler · 101.3 miles

Registration open

Race dateJanuary 16-17, 2027

Duration2 days

Start7:00am

Whenin 84 days

Who's going to Coldwater Hundred?

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 Aid stations 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 The race

101.3 miles

Climb The race

8,687 ft

Descent

not checked yet

High point The race

1,449 ft

Time limit The race

32:00:00

Aid stations

Started

not checked yet

Finished

not checked yet

Finish rate

not checked yet

The course

Where it goes multi-loop · 17 aid stations

Course line from the race's own GPX. Source file. Year of this file not known.

Two Red Loops then three Blue Loops on desert trail, coming through Rumble HQ four times.

Mostly rolling singletrack and double track with no single big climb. A sandy wash section of 1.5-2 miles on the back half (Corgett Wash). Zero shade, 30-40 degree swings between day and night. Night running from 6pm until after 7am. Hiking poles allowed. Buckles to 100 mile finishers under 32 hours; sub-24 hour buckle under 24 hours. Course: Red Loop, Red Loop, Blue Loop, Blue Loop, Blue Loop; Red Loop 10 miles, Blue Loop 27 miles.

The race

What this one is

Desert trail races in the foothills of the Sierra Estrella mountains at Estrella Mountain Regional Park in Goodyear, Arizona, put on by Aravaipa Running. A 100 mile, 100K, 50K, 20 mile, 10 mile and 5 mile all start the same Saturday morning. The 100 mile gives runners 32 hours.

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

Running, crewing, pacing or still deciding

How NavRun helps with Coldwater Hundred Thirty two hours, and five stations with a clock on each.

You are running it

You reach Rumble HQ IV, mile 74.1, before its 6:30am cutoff, and you already knew that this morning.

An arrival time for all 15 stations, worked out from your own training.

Start free →

You are pacing

You are at Rumble HQ III, mile 47.1, warm and fed, and you know you have 54 miles ahead of you.

The same sheet says when they reach you.

You are deciding

You find out Coldwater Hundred is months of work away, not years, and you enter.

Put in a race you have already run. NavRun shows you where this one sits from where you are.

No account needed →

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 aravaiparunning.com

Vehicles per runner: not checked yet

Pacers: Yes, from mile 47.10 aravaiparunning.com

Muling: Not allowed aravaiparunning.com

Drop bags: Yes aravaiparunning.com

Cupless: Yes aravaiparunning.com

Course marking: Fully Marked aravaiparunning.com

Night running: Yes aravaiparunning.com

Dogs: not checked yet

Headphones: Allowed aravaiparunning.com

Crew rules: Crews are welcome near the start/finish at the Competitive Track ("Rumble Headquarters"). Canopies are welcome along the course where runners come through every lap. Crews are also allowed at Horse Thief Aid, but structures cannot be set up and there is no camping. aravaiparunning.com

Pacer rules: Pacers may join after mile 47.1 (last two Blue Loops) and can enter or exit at Rumble HQ and Horse Thief Aid. One pacer per runner at a time. Pacers must be human and on foot. No shuttles for pacers. Pacers need no bib and need not sign in or out. aravaiparunning.com

Drop bag rules: A drop bag at Rumble HQ (start/finish) for all distances. 100 Mile, 100K and 60K runners may also have a remote drop bag at Horse Thief Aid. There is no set timeline for drop bags returning to Rumble HQ. aravaiparunning.com

Cutoff philosophy: Mid-race cutoffs are for leaving aid stations, not arriving. Hard cutoffs: clear the second Red Loop by 1:30pm Saturday, start the final Blue Loop by 6:30am Sunday, leave Horse Thief Aid by 12:30pm Sunday, final cutoff 3:00pm Sunday. Soft cutoffs at Rainbow Valley (9:15am) and Pedersen (10:00am) may be enforced at RD discretion. aravaiparunning.com

Aid stations

Every stop, and what you get there ● yes ○ no ? nobody has checked – does not apply to this race

Mile	Station	Cutoff	Crew access	Bag	Pacer	Med	To next
0.00	Start NoneSignal wrong?	?	●	●	?	?	3.00
3.00	Gila I NoneSignal wrong?	?	?	?	?	?	7.00
10.00	Rumble HQ I NoneSignal wrong?	?	●	●	?	?	3.00
13.00	Gila II NoneSignal wrong?	?	?	?	?	?	7.00
20.00	Rumble HQ II NoneSignal wrong?	1:30pm	●	●	?	?	8.60
28.60	Rainbow Valley NoneSignal wrong?	?	?	?	?	?	2.40
31.00	Pedersen I NoneSignal wrong?	?	?	?	?	?	8.20
39.20	Horse Thief I NoneSignal wrong?	?	●	●	?	?	7.90
47.10	Rumble HQ III NoneSignal wrong?	?	●	●	●	?	8.50
55.60	Rainbow Valley NoneSignal wrong?	?	?	?	?	?	2.40
58.00	Pedersen II NoneSignal wrong?	?	?	?	?	?	8.20
66.20	Horse Thief II NoneSignal wrong?	?	●	●	●	?	7.90
74.10	Rumble HQ IV NoneSignal wrong?	6:30am	●	●	●	?	8.60
82.70	Rainbow Valley NoneSignal wrong?	9:15am	?	?	?	?	2.40
85.10	Pedersen III NoneSignal wrong?	10:00am	?	?	?	?	8.20
93.30	Horse Thief III NoneSignal wrong?	12:30pm	●	●	●	?	7.90
101.20	Finish NoneSignal wrong?	3:00pm	●	●	?	?	?

Same race, other lines

Other distances and other years

Other distances: 100K (64.2 miles)
50K (32.2 miles)
20 Miler (20 miles)
10 Miler (9.5 miles)
5 Miler (5 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.

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

Social account

aravaiparunning

Social account

Aravaipa Running

Social account

Stampede of Two | 2024 Coldwater Rumble 100 Mile

Recap

All (3) Recap (1) Social account (2)

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.

Which distance? Leave blank if it applies to the whole race.

Which stop? Leave blank if it is not about one particular stop.

Give it a short title: Optional. Something like “Cal Street, mile 62 to 78”.

What do you wish someone had told you? Write it the way you would say it to someone at the start line.

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

What year? Optional.

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

Website: 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.

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

What does the page say now? Copy it as it appears, so we can find it.

What should it say? The corrected value.

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

A link that shows it: Optional.

Or a photo of it: Optional. A screenshot or a photo of the sign works.

Were you there? Optional, and it decides nothing.

What year? Optional.

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

Which distance? Leave blank if it is about the whole race.

Which stop? Leave blank if it is not about one particular stop.

Website: 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.

What does it show that the page cannot? Required. A line is plenty. Where the climbs are, what the footing does, what the last twenty miles look like.

Were you there? Optional, and it decides nothing.

What year? Optional.

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

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

What kind of thing is it?

Who made it? Optional, and we credit them on the page.

Website: 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.

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.

Where this came from. Every fact on this page records its source and when we last checked it: 100 sources for this race. Hover a source link to read the sentence it came from.

41% 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.