RunRace USA › California › Sean O'Brien 100K/50M/50K/26.2/30K
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 77 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.
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.
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See every race on the California calendar, California Marathons, California Ultras, or use the Race Finder for maps and filters.