Sean O'Brien 100K

Calabasas, United States • 23 Jan 2027

Sean O'Brien 100K/50M/50K/26.2/30K - January 31, 2026

This event is a set of trail races held in Calabasas, CA, with a listed venue at 1925 Las Virgenes Road. The program for the date includes multiple distances on trail terrain and references course viewpoint photos such as Mile 7 and Mile 15 and general trail views.

The 100k distance is designated as a 2026 WS100 qualifier. The event appears as part of a trail race series and includes marathon and shorter ultramarathon options. The page for the event lists maps and directions for the location.

Distances offered include:

  • 100k
  • 50 mile
  • 50k
  • Marathon (26.2)
  • 30k

The description presents factual details about location, offered distances, and the qualifier status for the 100k. No start or finish times are provided in the available information. Visit the organization's website for the most recent information.

Race information

100 km
100k
50 mi
50 Miler
50 km
50k
26 mi
Marathon
30 km
30k
Visit the organization's website for the most recent information.
Trail runs nearby

Experience the scenic beauty of the Santa Monica Mountains at the 41st annual Great Race. Choose from multiple distances including a panoramic half marathon, 10K, and 5K, followed by a large post-race celebration in Chumash Park.

A community trail run at Ernest Debs Park organized by True Heart Fitness. The loop follows several named trails, passes Debs Lake, and includes steep sections; participants are responsible for their own safety.

Coastal trail racing at Point Mugu State Park with a 13.4 mile half marathon and a 6.9 mile 10k featuring ocean view switchbacks, finisher medals, free race photos, a 21 plus beer garden and post race amenities.

Las Virgenes Canyon Ultra Trail Races on April 25, 2026 in Woodland Hills, CA offers distances from 6K to 100K on rugged trails with climbs and open views. Aid stations are fully supported, the event is cupless and there are food and awards..

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