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Sean O'Brien 100K/50M/50K/26.2/30K

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

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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

Apuama does not sell tickets. Check prices and availability on the event's website.
100K Registration$323.00
50 Miler Registration$269.75
50K Registration$211.17
26.2 Registration$163.25
30K Registration$147.27
Event Website