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

Calabasas, California · Saturday, January 30, 2027 · 100K, 50 Mile, 50K, Marathon, 30K

Official race page & registration ↗

Sean O'Brien 100K/50M/50K/26.2/30K takes place on Saturday, January 30, 2027 in Calabasas, California. The race offers 5 distances: 100K, 50 Mile, 50K, Marathon, 30K. For anyone travelling in, Santa Clarita is about 23 miles away.

It is one of 112 races on the California calendar that January.

Date
Saturday, January 30, 2027
Location
Calabasas, California
Distances
100K, 50 Mile, 50K, Marathon, 30K

Listing from the 2027 race calendar, refreshed nightly. Details can change: confirm date and entry on the official race page before travelling. Spot an error? Tell us here.

Making a race weekend of it?

Stay near the start line in Calabasas: check in Jan 29, out Jan 31.

Hotels on Booking.com ↗ Hotels on Expedia ↗

Common questions

When is Sean O'Brien 100K/50M/50K/26.2/30K?

Sean O'Brien 100K/50M/50K/26.2/30K is scheduled for Saturday, January 30, 2027.

Where is Sean O'Brien 100K/50M/50K/26.2/30K held?

Sean O'Brien 100K/50M/50K/26.2/30K is held in Calabasas, California. It is about 23 miles from Santa Clarita.

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

The listed distances are 100K, 50 Mile, 50K, Marathon, 30K.

How do I register for Sean O'Brien 100K/50M/50K/26.2/30K?

Registration is handled on the official race page, linked at the top of this listing. Entry can close early if the race sells out.

More races nearby

Within about 60 miles, ordered by approximate straight-line distance between listed locations.

See every race on the California calendar, California Marathons, California Ultras, or use the Race Finder for maps and filters.