runfarwhere
Trail · 100K

Sean O'Brien

· starts 5:00 AM
Malibu, CA

WSER Qualifier
The race's site ↗

Sean O'Brien is a trail race of 62 miles (100 km) in Malibu, California. The next edition is on Saturday, February 27, 2027, starting at 5:00 AM. The race gives its climbing as 16,246 ft (4,952 m); measured from its course file, it's 14,862 ft (4,530 m). Its high point is 2,409 ft (734 m). It's a Western States 100 qualifier. Registration is open to all; registration opened on June 1, 2025. The field is about 250 runners.

62miDistance
16,246ftClimbing
250runnersField

The course

62miMeasured distance
12Aid stations
14,862ftMeasured climb
14,865ftDescent
2,409ftHigh point
96ftLow point

Questions about Sean O'Brien

When is Sean O'Brien 2027?

Sean O'Brien 2027 is on Saturday, February 27, 2027, starting at 5:00 AM local time.

Where is Sean O'Brien?

Sean O'Brien is held in Malibu, California.

How long is Sean O'Brien?

Sean O'Brien is 62 miles (100 km).

How much elevation gain does Sean O'Brien have?

Sean O'Brien has 16,246 ft (4,952 m) of elevation gain, as the race states it.

Is Sean O'Brien a Western States qualifier?

Yes. Sean O'Brien is on the Western States 100's list of qualifying races. Check wser.org for the qualifying standard and years.

How do you get into Sean O'Brien?

Sean O'Brien has open registration. Registration opened on June 1, 2025.

How many aid stations does Sean O'Brien have?

Sean O'Brien's course has 12 aid stations after the start.

Where can I see the Sean O'Brien elevation profile and aid station cutoffs?

runfarwhere has Sean O'Brien's course file. The outline, distance and climbing are free on its page; the elevation profile, aid stations with cutoffs and the GPX file are part of runfarwhere Premium.

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