Sean O'Brien Trail Races / organiser
Sean O'Brien Trail Races
Malibu, California, United States
23–24 Jan 2027
Provisional
Open
A Malibu Creek State Park trail race weekend with a 100K, 50 mile, 50K and shorter distances in the Santa Monica Mountains.
Train for this raceAbout
The Sean O'Brien Trail Races take place in the Santa Monica Mountains near Malibu, California. The courses use loops through Malibu Creek State Park and Westridge, with sunny, exposed climbs and ocean views.
The 100K and 50 mile are Western States qualifiers.
Distances
| Name | Distance | Gain | Loss | Vert / km | Min altitude | Max altitude | Start | Start location | Finish | Course | Cutoff | Terrain | Technicality | Aid stations | Badges | Entry fee |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sean O'Brien 100K | 99.9 km | 1,980 m | — | 19.8 m/km | — | — | 23 Jan 2027 05:00 America/Los_Angeles | Malibu Creek State Park | Malibu Creek State Park | Multi loop | — | Mountain | — | — | — | — |
| Sean O'Brien 50K | 50 km | 1,200 m | — | 24.0 m/km | — | — | 23 Jan 2027 | Malibu Creek State Park | Malibu Creek State Park | Loop | — | Mountain | — | — | — | — |
Sean O'Brien 100K terrain notes
Dry, open Santa Monica Mountains singletrack and fire roads.
Sean O'Brien 50K terrain notes
Dry, open Santa Monica Mountains singletrack and fire roads.
Registration
- Status
- Open
Links
Notes
Late January.