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Sean O'Brien 100K/50M/50K/26.2/30K race video

Sean O'Brien 100K/50M/50K/26.2/30K

The city you want to run becomes your next trip.

USJan 30, 2027100km
YouTube · Andy Ferrer
Race date in 117 days
Jan 30, 2027 Sat
City · Distance
Calabasas · 100km
Entry fee
$300From the 2026 edition
Status
ClosedTBD ~ Tue, December 1, 2026See how to enter ↗
Official website ↗D-day as of Oct 5, 2026
About the raceRunner storiesHow to enterCourseRace PrepTravel
Why you dream of this race

THE DREAM

About Sean O'Brien 100K/50M/50K/26.2/30K — what makes it special

ABOUT THE RACE

A day you'll remember,
long past the finish line.

A historic mountain race on California’s Backbone Trail through the Santa Monica Mountains.

Five distances, from 100K to 30K, start in waves from 5:30 a.m.

The 50-mile event is a Silver Ticket qualifier for Angeles Crest 100—a traditional, cup-free trail race.

The road to your own record

Picture the course in advance
and find the pace that fits you.

When the city cheers

Streets lined with cheers, runners all around.
You'll be part of that scene.

The trip that follows the run

Take it slow with the finish still in you,
and meet the city all over again.

Sean O'Brien 100K/50M/50K/26.2/30K runner reviews and race reports

Stories from those who ran it first.

From the joy of finishing to the tough moments — read what runners wrote themselves.

Race reports: 2
ekrFinish time 12:53
“I was able to keep pushing right to the end, though, so I still had some gas.”

At the Sean O’Brien 100km, knee pain and cautious descending cost the runner time, but pushing through to the finish produced a personal best.

Read the original on Educated Guesswork
Bull DozierFinish time 12:46:20
“Looking back, starting the race slowly and without pressure was a huge benefit.”

At the Sean O’Brien 100km, the runner struggled through mud and rain but regained strength late in the race and finished within 13 hours.

Read the original on Run 200 Miles

We translated a short line from each public race report and summarized the experience. Finish times are as stated by the author, and past editions may differ from this year's weather and operations.

See it on video,
feel it through their stories.

Preview the course and read what runners who went before you wrote.

Sean O’ Brien 100K Race Recap 2026

Andy Ferrer

View on YouTube

This may be from a past edition. Check the organizer for this year's course and operations.

The way in that fits you

YOUR ENTRY

How to enter Sean O'Brien 100K/50M/50K/26.2/30K — registration routes

How to reach the start line —
start with what fits you.

Here are the ways to enter and what each requires.
Check the organizer's page for whether entries are open.

From the 2026 edition
Next edition entry

Entry dates for the next edition haven't been announced yet

About 30K
Official race websiteEntry options
From the start line to the finish

RACE WEEK

Sean O'Brien 100K/50M/50K/26.2/30K course map and elevation

The 100km I'll run

Know the course and time limit, and race day comes into focus.

Runners start · local timeFrom 05:30
EventStart
Ultra50km07:00
Marathon42.195km07:00
Other30km07:00
START

1925 Las Virgenes Road, Calabasas, CA

Start · Google Maps
FINISH

Malibu Creek State Park

Finish · Google Maps
Show more

The event offers 100K, 50 Miler, 50K, 26.2, and 30K distances.

Start line is located in Calabasas, CA, with a local start time of 5:30am.

The finish is at Malibu Creek State Park.

Typical race-season temperature: around 14°C (56°F)
Short sleeves or light long sleeves + arm warmers

Participant benefits

Not yet confirmed in the official race guide

Where and when to collect your Sean O'Brien 100K/50M/50K/26.2/30K race bib

To the start line,
step by step.

Pick up your bib, check your wave.
So on race morning, you can just run.

From the 2026 edition

Pick up your bib at the expo

Packet pickup information has not yet been announced.
For small trail races, race-morning on-site pickup is common; check the registration page announcement for details.

Malibu Creek State Park

Google MapsDirections
Stations & transport near the venue

Getting to the start

Malibu Creek State Park, 1925 Las Virgenes Road, Calabasas, CA 91302 (course picks up Backbone Trail after crossing near Malibu Canyon Rd/Piuma Rd, per secondary sources)

No public transit;

car access only.

Parking is $15 at the gate, cash only, exact change requested.

Staggered starts: 100K 5:30am, 50 Mile 6:00am, 50K/Marathon/30K 7:00am.

Getting to the finish

Malibu Creek State Park (same venue as start — out-and-back/loop Backbone Trail course)

Finish co-located with start at Malibu Creek State Park;

specific finish-line location beyond the park address not separately stated.

More details

No shuttle service details found in available official sources.

Stations & transport near the venue

The race starts/finishes in the Santa Monica Mountains near Malibu Creek State Park, a car-access trailhead with no public transit serving the start line.

LA Metro operates in the broader region and now supports tapping a contactless bank card or phone wallet directly at turnstiles/validators (no need to buy a physical TAP card),

with fares capped around $5/day, but this only gets a visitor to urban LA, not the trailhead.

Plan on a rental car or rideshare for the actual race venue.

Source · checked Aug 24, 2026
READY TO RUN

From race morning to after the finish.

Your start time, fuel and bag drop.
Know them ahead and the run feels easier.

Starting at 1925 Las Virgenes Road in Calabasas, California, this race loops through Santa Monica Mountains trails,

with five events held together: 100km, 50 miles, 50km, marathon (26.2 miles), and 30km.

Start times vary by distance, staggered at 5:30 AM, 6:00 AM, and 7:00 AM.

It's a "cupless" race with no cups provided on course, so participants must carry their own hydration gear.

The 50-mile event is designated as a Silver Ticket qualifier for the Angeles Crest 100 Mile,

making it especially popular among runners chasing entry to that race.

Registration reportedly opens each year at 6:00 AM Pacific Time on July 1.

Times are local to Calabasas. Check the latest official information before the race.

A trip built around the race

STAY A LITTLE

MAKE IT A RUNTRIP

The race is one day,
the trip can be longer.

From a hotel that makes race morning easy,
to the meals and views you'll enjoy with the medal on.

Hotels near the Sean O'Brien 100K/50M/50K/26.2/30K start line in Calabasas

Hotels that make race morning easyHotels to rest in right after the finish

Distances are straight-line from the start.
Check real travel times and booking terms with each hotel.

Distances are straight-line from the finish.
Check real travel times and booking terms with each hotel.

The start and finish are 1.7km apart.

Eco-Luxe Airstream Hideaway - Minutes to Malibu Beaches

Accommodation · 2.4km

View on Booking.com

Eco-Luxe Airstream Hideaway - Minutes to Malibu Beaches

Accommodation · 4.0km

View on Booking.com

Swipe sideways to see more hotels.

View on map →
View on map →

Time for you, before and after the finish

33 experiences

Rest a little, wander a little.
Pick what suits you and whoever you're with.

Los Angeles｜Private airport pickup/drop-off service at Van Nuys Airport

$70

View on Klook

Los Angeles｜White Man Airport Private Airport Pickup/Drop-Off Service

$164

View on Klook

Los Angeles｜Private Airport Pickup/Drop-Off Service from Los Angeles International Airport

$53

View on Klook

Hotel – Citadel Outlets & Los Angeles International Airport Transfer Service

$128

View on Klook

LA Universal Studios Hollywood Halloween Horror Nights Admission Ticket

$79

View on Klook

Los Angeles Academy Museum of Motion Pictures Ticket

$25

View on Klook

Los Angeles Natural History Museum Admission Ticket

$17

View on Klook

Marina del Rey Sea Lion Kayaking/Paddleboarding Experience

$82

View on Klook

Los Angeles Downtown Highlights Half-Day Electric Bike Tour

$258

View on Klook

Warner Bros. Studio Admission & Hop-On Hop-Off Bus Tour with Audio Guide

$115

View on Klook

LA City & Iconic Beaches Day Tour with Optional Transportation

$102

View on Klook

Private Tour of Hollywood, Beverly Hills, Santa Monica & Venice Beach

$777

View on Klook
Eating well is part of the tripA meal before the race, a dinner to celebrate the finish.View on mapSeeing Calabasas with the medal onThe city you ran — this time, a little slower.View on map

Hotel distances are straight-line from the start. Distances and ratings for food and sights come from the place provider, and experiences are travel products in Calabasas.

Total cost and budget for Sean O'Brien 100K/50M/50K/26.2/30K

TRAVEL ESSENTIALS

Trip prep too,
light and in one place.

ChecklistLocal eSIM · YesimFlight delay or cancellation compensation · AirHelpPace calculator

Once saved, you can open this page without an internet connection

Runner stories and questions about Sean O'Brien 100K/50M/50K/26.2/30K

RUN TOGETHER

With runners who dream of
the same start line.

Be the first runner
Leave this room's first post

Calabasas runners' room

Frequently asked questions about Sean O'Brien 100K/50M/50K/26.2/30K

FAQ
When does Sean O'Brien 100K/50M/50K/26.2/30K 2027 take place?

It takes place on Sat, January 30, 2027 in Calabasas, CA, United States.

What distances does Sean O'Brien 100K/50M/50K/26.2/30K 2027 offer?

Ultra.

What time does Sean O'Brien 100K/50M/50K/26.2/30K 2027 start?

The race starts at 05:30.

Where does Sean O'Brien 100K/50M/50K/26.2/30K 2027 start?

1925 Las Virgenes Road, Calabasas, CA.

Where does Sean O'Brien 100K/50M/50K/26.2/30K 2027 finish?

Malibu Creek State Park.

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