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Ultras · US · CO

Ouray 100 Mile Endurance Run

On the calendar
The date is set. Entry has not opened. Registration opens December 5, 2026 at 12:00 PM MT.
Race dateJuly 16-18, 2027
Duration3 days
Start8:00am
Whenin 265 days

Who's going to Ouray 100 Mile Endurance Run?

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 Crew access 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
102.1 miles
Climb The race
41,862 ft
Descent The race
41,863 ft
High point The race
13,365 ft
Time limit The race
52:00:00
Aid stations
17
Started
not checked yet
Finished
not checked yet
Finish rate
not checked yet
The course

Where it goes loop · 17 aid stations · rust marks a stop your crew can reach

No official GPX on file yet. These are the aid station coordinates, not the trail. Have the GPX? Send us the link.

Starts and finishes at Fellin Park, only yards from the hot springs. The route includes Camp Bird Road, Silver Basin, Imogene Pass Road, Chicago Tunnel, Fort Peabody, Ptarmigan Lake, Richmond Trail, Ironton, Corkscrew Gulch, Gray Copper Trail, Weehawken Trail/Alpine Mine Overlook, Hayden Trail/Crystal Lake, Old Twin Peaks Trail, Silvershield Trail, Perimeter Trail/Lower Cascade Trail, Chief Ouray Mine Trail, and Old Horsethief Trail/Bridge of Heaven.

Fourteen climbs, with the high point at Fort Peabody, 13,365 ft. The race says the back 50 is harder than the front 50. Runners hole punch their bib at several unmanned out and backs to prove they completed the course.

The race

What this one is

A 102.1-mile run starting and finishing at Fellin Park in Ouray, Colorado, next to the hot springs. The route climbs about 41,862 feet through the San Juan Mountains on old mining roads and trails, with out-and-backs from Lower Camp Bird, Richmond, Ironton and Weehawken and several passes back through Fellin Park. Runners have 52 hours. The race calls itself low key, no frills and old school.

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
Official finish at Ouray 50 or 100 in last 3 years, OR a start at Ouray 50 or 100 in the prior year, OR between January 1 of the prior year and the race start: 50 miles in under 11 hours, or an official finish at Quad Rock 50, Silver Rush 50, San Juan Solstice 50, Zane Grey 50, another mountain/difficult 50+ mile race, a 100-kilometer or 100-mile trail race within the official cutoff, at least 55 miles in a 12-hour timed event, or at least 90 miles in a 24-hour timed event. Proof must be provided before the event. ouray100.com
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 docs.google.com
Vehicles per runner
not checked yet
Pacers
Yes, from mile 53.70 ouray100.com
Muling
Not allowed ouray100.com
Drop bags
Yes docs.google.com
Cupless
not checked yet
Course marking
Fully Marked ouray100.com
Night running
not checked yet
Dogs
not checked yet
Headphones
not checked yet
Crew rules
Crew can reach Ironton, Crystal Lake, Silvershield and Fellin Park. Lower Camp Bird and Richmond Trailhead have no crew access. Weehawken is for pacers, dropping off a pacer or picking up a dropped runner. docs.google.com
Pacer rules
Pacers are allowed from mile 53.7 (Weehawken Aid Station to finish) and must sign a USATF waiver. Runners age 60 and over may have a pacer for the entire race. Runners with physical disabilities may have pacers for the entire race with prior Race Director approval. ouray100.com
Drop bag rules
Drop bags are available at Ironton, Weehawken and Fellin Park. Bags must be clearly marked with the runner's name and bib number and be weatherproofed. Leftover bags are donated to Goodwill. ouray100.com
Cutoff philosophy
The race suggests planning around most or all of the 52 hours: "I strongly recommend you have a plan based on using most of all of the allotted time." ouray100.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 Fellin Park
7,699 ft · Signal wrong?
 ? ● ? ? ? 5.50
5.50 Lower Camp Bird
9,770 ft · Signal wrong?
 ? ○ ○ ? ? 6.00
11.50 Lower Camp Bird
9,770 ft · Signal wrong?
 ? ○ ○ ? ? 2.00
13.50 Richmond
10,954 ft · Signal wrong?
 ? ○ ○ ? ? 7.80
21.30 Richmond
10,954 ft · Signal wrong?
 ? ○ ○ ? ? 6.00
27.30 Ironton
9,705 ft · Signal wrong?
 ? ● ● ? ? 8.10
35.40 Ironton
9,705 ft · Signal wrong?
 ? ● ● ? ? 8.20
43.60 Ironton
9,705 ft · Signal wrong?
 ? ● ● ? ? 5.90
49.50 Richmond
10,954 ft · Signal wrong?
 ? ○ ○ ? ? 4.20
53.70 Weehawken
8,750 ft · Signal wrong?
 ? ○ ● ● ? 5.10
58.80 Weehawken
8,750 ft · Signal wrong?
 ? ○ ● ? ? 7.10
65.90 Crystal Lake
9,606 ft · Signal wrong?
 ? ● ○ ? ? 8.60
74.50 Fellin Park
7,699 ft · Signal wrong?
 ? ● ● ? ? 6.30
80.80 Silvershield
7,643 ft · Signal wrong?
 ? ● ○ ? ? 4.00
84.80 Fellin Park
7,699 ft · Signal wrong?
 ? ● ● ? ? 6.70
91.50 Fellin Park
7,699 ft · Signal wrong?
 ? ● ● ? ? 10.60
102.10 Fellin Park (Finish)
7,699 ft · Signal wrong?
 ? ● ● ? ? ?
Driving your crew

Getting your people there 7 stops with directions the race published.

Fellin Park mile 0.00

Fellin Park is the big field immediately south of the Ouray Hot Springs on the north side of town. Park in the hot springs parking lot and make your way to the large gazebo.

Parking. Park on a nearby side road (e.g. 8th Ave., 7th Ave., 2nd St.), where parking is allowed for three days. Do not park on Main Street or in the RV lot south of the gazebo overnight, or in the hot springs lot for any extended period.

docs.google.com
Lower Camp Bird mile 5.50

Right (south) out of the hot springs parking lot. Go 1.1 miles on HWY550. Take a right onto CR361. Go 4.7 miles. Stop at the fork.

docs.google.com
Richmond mile 13.50

From Lower Camp Bird, go left at the fork. Go 2.1 miles. Aid station is at the second water crossing.

docs.google.com
Ironton mile 27.30

Right (south) out of the hot springs parking lot. 8.4 miles on HWY550. Ironton will be on your left.

docs.google.com
Weehawken mile 53.70

Right (south) out of the hot springs parking lot. Go 1.1 miles on HWY550. Take a right onto CR361. Go 2.6 miles. Look for small clearing on right, immediately before the Thistledown Campground.

docs.google.com
Crystal Lake mile 65.90

Right (south) out of the hot springs parking lot. 6.9 miles on HWY550. Crystal Lake will be on your right.

docs.google.com
Silvershield mile 80.80

Right (south) out of the hot springs parking lot. Go 0.4 miles. Right (west) onto 7th Avenue for 0.2 miles. Right (north) onto Oak St for 1.2 miles. Left (west) onto Silver Shield Trail (this is a road) for 100 yards.

docs.google.com
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: 236 sources for this race. Hover a source link to read the sentence it came from.
47% 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.