Complete 2015 Race Results
Congratulations to our winners and all the runners.
Click here to see how your favorite runner did.

2015 Race Photos
Click here for race photos. Big thanks to Stepahnie Plomarity providing us with the photography.


Courtesy of Billy Yang.

Courtesy of The Ginger Runner.

2014 Race Results
Congratulations to all our runners and top finishers! Click here for all the results.

50Mile (complete results)
Dylan Bowman, 6:23:17 (top male)
Cassie Scalion, 7:38:16 (top female)

50K (complete results)
Kalib Wilkinson, 4:15:09 (top male and overall)
Kelly Cronin, 5:22:58 (top female)

Marathon (complete results)
Gerardo Barrios, 4:35:10 (top male and overall)
Kristin Cooley, 4:53:39 (top female)

Race Photos
The finish line pics are up. Thank you, Alex Alcantar for the awesome shots. Click to see them.

Message from Race Director Keira Henninger:

MHWThe Sean O'Brien 50M/50k/26M was created after the original Ray Miller course had suffered a devastating fire in early May. The area was badly burned, and in my opinion needed time to heal. I was inspired to still bring a solid, competitive, and tough 50 mile/50k race to southern California in early winter. I also had a deep desire to still have this sort of race in the beautiful Santa Monica Mountains.

The result was the creation of one of the most epic race courses to date on the West Coast. Personally mapped out and created by my close friend, Sean O'Brien, it only seemed fair to name the race after him. The race course consists of beautiful single-track on the Backbone Trail, miles of sweeping ocean views, and close to 11,000+ feet of gain in the 50-mile distance. The backcountry trails of the Santa Monica Mountains are breathtaking and some parts rarely touched.

The race will have four distances to choose from: 100 kilometeres, 50 miles, 50 kilometers, and 26.2 miles. I am honored to be bringing such an epic event to the ultra running community, and I look forward to you all running it!

The 50-Mile race is now part of the 2014 Montrail Ultra Cup. Note that the TOP TWO men and TOP TWO women will get auto-entry into Western States in 2014.

Click here for more information about Malibu Creek State Park.

Rock Art


Hampton Inn & Suites

Runners that stay Friday or Saturday will get a special rate of just $103 plus taxes per night.

To obtain the discount, guests must mention the date and either the group code "RUN" or group name "Sean O’Brien Trail Races" before January 2, 2014. After January 2nd they will try to honor the prices and have availability, but they cannot guarantee this. To get the discounts all the guests need to do is go online to www.agourahills.hamptoninn.com. Once at the site enter the date of arrival in the "check availability" section and select go. Enter the three letter code "RUN" and continue through check out  or you could call 800 HAMPTON(426-7866) or 818 597-0333 and also reference the code RUN or group name.

Castro Crest View





Griffith Trail Marathon

Leona Divide

Griffith Park Trail Half-marathon

Griffith Park Trail 10K



Keira Henninger, R.D.
Home Race DetailsCourse InfoSponsorsResults Twitter Blogger Facebook