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Sean O'Brien 100K

Name: Sean O'Brien 100K
Start: 2027-01-30
End: 2027-01-30
Location: Calabasas

Calabasas, United States • 30 Jan 2027

Sean O'Brien Trail Runs : Calabasas, CA

The Sean O'Brien trail race weekend is scheduled for January 30, 2027 in Calabasas, California. The event is organized by Keira Henninger Events and is listed as an in-person trail running event at 1925 Las Virgenes Road, Calabasas, CA.

Multiple distance options are offered on the trail course, including:

100K
50 Miler
50K
Marathon (26.2 miles)
30K

The 100K distance is designated as a 2026 WS100 qualifier. Registration for the event opens on Wednesday, July 1, 2026 at 6:00 AM PT. The event listing includes route views and specified mile viewpoints for participants and spectators.

Information on the site identifies the event as scheduled and held offline at the listed location. Details such as exact course layout and aid station placement are indicated on event materials and maps provided by the organizer. 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

26 mi

26.2

30 km

30k

Visit the organization's website for the most recent information.

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Malibu

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