The Bulldog Ultra
- Trail Run
- 29 km
- 15 km
Calabasas, California, United States
Sean O'Brien 100K/50M/50K/26.2/30K
- Running
- 161 km
- 80 km
- 50 km
- Marathon
- 30 km
1925 Las Virgenes Road, Calabasas, CA
About the Event
Sean O'Brien 100K/50M/50K/26.2/30K
Register Saturday, Jan 31, 2026 at 1925 Las Virgenes Road Calabasas, CA.
Distances offered: 100k, 50 mile, 50k, Marathon, and 30k. The 100k is a 2026 WS100 qualifier.
- 100K: 5:30 AM
- 50 Miler: 6:00 AM
- 50K: 7:00 AM
- 26.2: 7:00 AM
- 30K: 7:00 AM
Registration closes: Sat, Nov 15 @ 11:59PM PT
Registration Fees (incl. taxes & fees):
- 100K: $323.00
- 50 Miler: $269.75
- 50K: $211.17
- 26.2: $163.25
- 30K: $147.27
How to get there
Courses
Tickets
This event is not sold through Apuama. Check prices and availability directly on the organizer's website.
| 100K Registration | $323.00 | View |
| 50 Miler Registration | $269.75 | View |
| 50K Registration | $211.17 | View |
| 26.2 Registration | $163.25 | View |
| 30K Registration | $147.27 | View |
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