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Ultras · US · OR

Mountain Lakes 100

Waitlist only
Home page call to action reads "Volunteer or Get on the Wait List" (rather than "Register"), indicating the 150-entrant field is full and only wait list entries are being taken as of this research, ~4 weeks before race day.
Race dateSeptember 19-20, 2026
Duration2 days
Start8:00am
When27 days ago
First held2014

Who's going to Mountain Lakes 100?

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 101.3 miles
Climb 11,700 ft
Descent 11,700 ft
High point 5,700 ft
Time limit 30:00:00
Aid stations 16
Started not checked yet
Finished not checked yet
Finish rate not checked yet
The course

Where it goes out and back · 16 aid stations

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

Point-to-point-style out-and-back course on the Pacific Crest Trail south of Olallie Lake: a ~12-mile loop out of Olallie Lake, then an out-and-back to the Clackamas Ranger Station / Timothy Lake Dam area (with Pinheads, Warm Springs, Red Wolf, Clackamas and Little Crater Lake aid stations each visited twice, outbound and again on the return), then a final leg via Olallie Meadows back to the Olallie Lake finish.

Officially branded "Mountain Lakes 100" but the race states the actual course is 101 miles ("This race is 101 miles ... Trust us, you'll run 101 miles"); the aid-station chart's own cumulative distance to the finish is 101.3 mi, which is what is recorded as both published and canonical distance here. 96 of the 101 miles are single-track, 5 miles jeep/gravel road. Recorded as out_and_back because that is the dominant, defining structure (recurring stations). Earphones are allowed but restricted to one ear only (Go Beyond Racing rules, race-wide).

The race

What this one is

A 101-mile point-to-point-and-back style ultramarathon on the Pacific Crest Trail south of Olallie Lake, Oregon, starting and finishing at Olallie Lake Resort and running between Mt. Jefferson and Mt. Hood.

The Olallie Lake start/finish area was burned in the 2020 Lionshead Fire and was unavailable for the 2021 and 2022 editions, which used a different venue; the race returned to Olallie Lake for a modified loop of the original route in 2023.

Getting in

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

Lottery
No ultrasignup.com
Lottery opens
not checked yet
Lottery draw
not checked yet
Field cap
150 gobeyondracing.com
Registration
UltraSignup ultrasignup.com
Qualifying
Western States 100 qualifier. gobeyondracing.com
Minimum age
not checked yet
Transfers
No gobeyondracing.com
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 gobeyondracing.com
Vehicles per runner
1 gobeyondracing.com
Pacers
Yes, from mile 71.70 gobeyondracing.com
Muling
Allowed gobeyondracing.com
Drop bags
Yes gobeyondracing.com
Cupless
Yes gobeyondracing.com
Course marking
Fully Marked gobeyondracing.com
Night running
Yes gobeyondracing.com
Dogs
Not allowed gobeyondracing.com
Headphones
Allowed gobeyondracing.com
Crew rules
"Runners are allowed ONE crew vehicle... Crew vehicles must display their Crew Pass on the dashboard at all times during the race... Crew is allowed only at the following Aid Stations: Aid Station #1/Olallie Lake (mile 12); Aid Station #5 & 10/Clackamas (mile 40 & mile 72); Aid Station #9/Dam (mile 68); Aid Station #14/Olallie Meadows (mile 97). Crew and vehicles are not allowed at any of the other aid stations. Runners whose crew access them anywhere on the course other than at the crew-accessible aid stations are disqualified." gobeyondracing.com
Pacer rules
"Runners are allowed to pick up a pacer at the Clackamas Aid Station #10 (as runners pass through the second time at mile 72), and at Olallie Meadows (for the final 3.6 miles the finish). ... Pacers must pick up Pacer Bibs and sign a waiver at the Clackamas or Olallie Meadows Aid Station prior to joining their runner. All Pacers must wear their Pacer Bib at all times when on course. Runners are allowed only one pacer to run with them at a time." gobeyondracing.com
Drop bag rules
"There are two drop bag locations; Olallie Lake mile 12 and at Clackamas miles 40 & 72. Drop bags are returned to the finish by 2 p.m. Sunday... Drop bags should be no more than 21 cubic liters (1,281 cubic inches)... One drop bag per aid station. Pacers are not allowed to have a drop bag." gobeyondracing.com
Cutoff philosophy
not checked yet
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
None · no cell service
? ● ? ? ? 12.20
12.20 Olallie Lake
None · no cell service
? ● ● ○ ? 10.20
22.40 Pinheads
None · no cell service
? ○ ○ ○ ? 7.20
29.60 Warm Springs
None · no cell service
? ○ ○ ○ ? 5.50
35.10 Red Wolf
None · no cell service
? ○ ○ ○ ? 5.30
40.40 Clackamas
None · no cell service
8:00pm ● ● ○ ? 6.10
46.50 Little Crater Lake
None · no cell service
? ○ ○ ○ ? 8.10
54.60 Frog Lake
None · no cell service
? ○ ○ ○ ? 8.10
62.70 Little Crater Lake
None · no cell service
? ○ ○ ○ ? 5.00
67.70 Dam
None · no cell service
? ● ○ ○ ? 4.00
71.70 Clackamas
None · no cell service
5:00am ● ● ● ? 5.30
77.00 Red Wolf
None · no cell service
? ○ ○ ○ ? 5.50
82.50 Warm Springs
None · no cell service
? ○ ○ ○ ? 7.20
89.70 Pinheads
None · no cell service
? ○ ○ ○ ? 8.00
97.70 Olallie Meadows
None · no cell service
? ● ○ ● ? 3.60
101.30 Finish
None · no cell service
2:00pm ● ● ○ ? ?
Same race, other lines

Other distances and other years

Other years
2027
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.

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: 220 sources for this race. Hover a source link to read the sentence it came from.
69% 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.