February 8th, 2020

100K – 5am
50-Mile – 6am
50K and Marathon – 7am

Malibu Creek State Park
1925 Las Virgenes Road
Calabasas, CA 91302


Option 1
Friday, February 7th from 3pm-7:30pm at Future Track Running Store.

Future Track Running Store
30125 Agoura Rd
Agora Hills, CA 91301

view map

If you get your bib on Friday please check in again on race morning. We will have a separate table set up to the right of registration just for this, so you do not have to wait in line in the morning.

Option 2
On race morning starting as early as 4:15am for 100K runners.
All other runners can check-in beginning at 5am.


There is plenty of parking at the race start on race morning. Volunteers will be on hand to direct you into the parking lots.

Parking is $15. Please bring exact change.


We will provide hot vegetarian chili, Subway turkey and veggie sandwiches, and plenty of healthy snacks and water.


Please note these are VERY tough courses, much tougher than the previous Ray Miller races. No exaggeration. Not at all recommended for a first 50-mile. All three race courses are extremely difficult. Absolutely no pacers allowed. Thank you.

This will be a cupless race. No plastic! We will not have cups at the aid stations. You must be self sufficient and carry hydration.

The 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 kilometers, 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!Message from Race Director Keira Henninger: