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Sean o'Brien

Calabasas, United States • 25 Jan 2025

The Sean O'Brien event offers a range of trail running distances including 100K, 50M, 50K, Marathon (26.2 miles), and 30K, taking place in Calabasas, CA. This race is notable as the 100K distance serves as a qualifier for the prestigious Western States 100 in 2026. The event is currently sold out, but interested participants can join the waitlist. The scenic course promises beautiful views and a challenging experience for runners of all levels. Registration for the event closes shortly before the race date. Visit the organization's website for the most recent information.

United States California Calabasas

Race information

Website Registration
100 km
100K
50 mi
50 Miler
50 km
50K
30 km
30K
26.2
Visit the organization's website for the most recent information.
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