The Sean O’Brien 50M/50k/26M was created after the original Ray Miller course had suffered a devastating fire. 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!

Upcoming Races

Jan 25 2025
50 KM
6,312 6,312 ft.
Out and Back Course
4 Aid Stations
9:30 Cutoff
4 Elevation Rating
Very hilly, ~7500-12,500 feet in 50 miles
3 Surface Rating
Some rocks, root, and/or ruts
Jan 25 2025
50 Miles
10,699 10,699 ft.
Lollipop Course
8 Aid Stations
16:00 Cutoff
4 Elevation Rating
Very hilly, ~7500-12,500 feet in 50 miles
3 Surface Rating
Some rocks, root, and/or ruts
Jan 25 2025
100 KM
13,104 13,104 ft.
Mixture Course
9 Aid Stations
17:00 Cutoff
4 Elevation Rating
Very hilly, ~7500-12,500 feet in 50 miles
3 Surface Rating
Some rocks, root, and/or ruts

Results

Date Finishers Top Result (M) Top Result (F)
01/27/24 91 4:06:02 5:29:44
01/28/23 99 4:44:50 6:24:12
02/02/19 Race Cancelled
02/03/18 182 3:57:23 5:22:42
02/04/17 185 4:40:29 5:11:54
02/06/16 139 4:39:10 5:01:23
02/07/15 198 4:25:58 5:32:39
02/01/14 151 4:15:09 5:22:58
Date Finishers Top Result (M) Top Result (F)
01/27/24 55 9:05:10 10:37:37
01/28/23 67 8:25:30 9:54:30
02/05/22 56 9:00:56 9:30:02
10/23/21 37 9:16:10 12:17:13
02/08/20 156 7:05:32 10:18:32
02/02/19 Race Cancelled
02/03/18 110 8:14:48 9:29:42
02/04/17 89 7:47:10 9:37:11
02/06/16 62 8:48:39 9:38:58
02/07/15 101 7:35:10 9:43:59
02/01/14 151 6:23:17 7:38:16
Date Finishers Top Result (M) Top Result (F)
01/27/24 73 10:00:01 11:59:20
01/28/23 91 9:02:03 11:58:18
02/05/22 62 9:30:02 11:47:05
10/23/21 30 10:11:53 11:58:10
02/08/20 127 10:10:33 10:59:55
02/02/19 Race Cancelled
02/03/18 134 8:48:04 9:38:17
02/04/17 137 8:24:35 9:56:15
02/06/16 72 9:37:22 10:27:02
02/07/15 93 8:41:41 9:51:27