Is crew access allowed on the 100K course?

Yes, crew access is allowed on the 100K course. Crews and pacers are allowed only at the 100K Turnaround - Bulldog aid station (mile 47.5). They must pay to park and hike 1/4 mile to the aid station; there is no direct vehicle access. No spectators or crews elsewhere along the course.

Are drop bags allowed on the 100K course?

Yes, drop bags are allowed on the 100K course. Drop bags must be in at 5am. Drop bags should have your bib number displayed on the outside. One drop bag per unique aid station location (i.e. only one drop bag required for Kanan #1 and Kanan #2). No glass or extra large/heavy bags/boxes/coolers. Drop bags must be securely closed for transport. Do not put valuables (including car keys) in drop bags.

Are pacers allowed on the 100K course?

Yes, pacers are allowed on the 100K course. Crew and pacers at the 100K Turnaround - Bulldog aid station (mile 47.5) only.

What is the cutoff time for the 100K course?

The overall time limit for the 100K course is 17 hours from the start. Overall cutoff & WSER qualifying time 17 hours. Runners who miss a listed cutoff are pulled. Some stations also list an earlier time at which a runner is dropped to the 50 mile.

Ultras · US · CA

Sean OBrien 100K/50M/50K/26.2/30K

100K · 61.7 miles

Registration open

Race dateJanuary 30, 2027

Start5:30am

Whenin 98 days

Who's going to Sean OBrien 100K/50M/50K/26.2/30K?

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

61.7 miles

Climb The race

13,179 ft

Descent

not checked yet

High point The race

2,408 ft

Time limit The race

17:00:00

Aid stations

Started

not checked yet

Finished

not checked yet

Finish rate

not checked yet

The course

Where it goes · 12 aid stations · rust marks a stop your crew can reach

Race page terrain: "Singletrack & fire road · well-marked". No elevation loss is published.

The race

What this one is

Trail races in Malibu Creek State Park, Calabasas, California, in the Santa Monica Mountains. Five distances (30K, marathon, 50K, 50 mile, 100K) start from the same park on the same morning at staggered times. The 100K is a Western States qualifier.

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 khraces.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 Sean OBrien 100K/50M/50K/26.2/30K Seventeen hours, and seven stations with a clock on each.

You are running it

You reach 100K Turnaround - Bulldog, mile 47.5, before its 6:30pm cutoff, and you already knew that this morning.

An arrival time for all 11 stations, worked out from your own training.

Start free →

You are crewing it

You park at 100K Turnaround - Bulldog, and you are standing there when they come in.

One link from your runner, with the stop and the window they arrive in.

You are pacing

You are at 100K Turnaround - Bulldog, mile 47.5, warm and fed, and you know you have 14 miles ahead of you.

The same sheet says when they reach you.

You are deciding

You find out Sean OBrien 100K/50M/50K/26.2/30K 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 khraces.com

Vehicles per runner: not checked yet

Pacers: Yes khraces.com

Muling: not checked yet

Drop bags: Yes khraces.com

Cupless: Yes khraces.com

Course marking: Fully Marked khraces.com

Night running: not checked yet

Dogs: not checked yet

Headphones: Allowed khraces.com

Crew rules: Crews and pacers are allowed only at the 100K Turnaround - Bulldog aid station (mile 47.5). They must pay to park and hike 1/4 mile to the aid station; there is no direct vehicle access. No spectators or crews elsewhere along the course. khraces.com

Pacer rules: Crew and pacers at the 100K Turnaround - Bulldog aid station (mile 47.5) only. khraces.com

Drop bag rules: Drop bags must be in at 5am. Drop bags should have your bib number displayed on the outside. One drop bag per unique aid station location (i.e. only one drop bag required for Kanan #1 and Kanan #2). No glass or extra large/heavy bags/boxes/coolers. Drop bags must be securely closed for transport. Do not put valuables (including car keys) in drop bags. khraces.com

Cutoff philosophy: Overall cutoff & WSER qualifying time 17 hours. Runners who miss a listed cutoff are pulled. Some stations also list an earlier time at which a runner is dropped to the 50 mile. khraces.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
7.30	Corral Canyon #1 NoneSignal wrong?	?	○	○	○	?	6.20
13.50	Kanan Road #1 NoneSignal wrong?	?	○	●	○	?	2.60
16.10	Zuma Edison Ridge Motorway #1 NoneSignal wrong?	?	○	○	○	?	6.20
22.30	Bonsall #1 NoneSignal wrong?	12:00pm	○	●	○	?	3.50
25.80	Bonsall #2 NoneSignal wrong?	1:30pm	○	●	○	?	6.20
32.00	Zuma Edison Ridge Motorway #2 NoneSignal wrong?	3:45pm	○	○	○	?	2.60
34.60	Kanan Road #2 NoneSignal wrong?	4:30pm	○	●	○	?	6.20
40.80	Corral Canyon #2 NoneSignal wrong?	?	○	○	○	?	6.70
47.50	100K Turnaround - Bulldog NoneSignal wrong?	6:30pm	●	●	●	?	6.70
54.20	Corral Canyon #3 NoneSignal wrong?	8:30pm	○	○	○	?	5.30
59.50	Piuma Creek (no aid) NoneSignal wrong?	10:00pm	○	○	?	?	2.20
61.70	Finish Line NoneSignal wrong?	10:30pm	?	●	?	?	?

Driving your crew

Getting your people there 1 stop with directions the race published.

100K Turnaround - Bulldog mile 47.50 cutoff 6:30pm

Parking. Crews/pacers must pay to park and hike 1/4 mile to the aid station location. There is no direct vehicle access. No overnight parking in the Day Use Area at Malibu Creek State Park.

Same race, other lines

Other distances and other years

Other distances: 50 Miler (49 miles)
50K (32.1 miles)
26.2 (27.2 miles)
30K (19.4 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

Sean O'Brien Trail Races (Facebook)

Social account

khraces (Instagram)

Social account

KH Races (Facebook)

Social account

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

33% 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.