10K
Start7:30 AM
6.2Miles
344Ft Gain
915Ft High
Orange County · Trail Series
O’Neill Park Trail Races
Distances510K → 50K
Race DaySat, May 15, 2027All start 7:30 AM
WhereO'Neill Regional ParkTrabuco Canyon, CA
TerrainSingletrack& fire road · well-marked
Must-read before race day
Athlete Guide
Start times, aid stations, cutoffs, parking, crew access and drop bags — everything you need for race day.
Choose your distance
Tap Course Map on any distance to explore its route and elevation, then register on UltraSignup.
Half Marathon
Start7:30 AM
13.4Miles
1,614Ft Gain
1,351Ft High
30K
Start7:30 AM
18Miles
1,906Ft Gain
1,348Ft High
Marathon
Start7:30 AM
26.4Miles
2,332Ft Gain
1,154Ft High
50K
Start7:30 AM
31.7Miles
3,211Ft Gain
1,351Ft High
The Race
Epic trail racing
Epic trail racing
in Trabuco Canyon
The Archive
Results & photos
Relive past editions — full results and race-day galleries. Pick a year.
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Course
Interactive map & elevation via HelloDrifterRegister