These are Skybreaker Racing-owned events, some of which are under the Singletrack Running umbrella.
If you have SBR race credit, it can be applied to any of these events.
March 28th, 2026 | Bad Ass Backyard Ultra Last-Person-Standing Event | Rio Linda, CA “Hee-haw!” | |
May 31st, 2025 | Sonoma Coast Trail Runs 50K | Trail Marathon 30K | Half Marathon | Duncans Mills, CA “The Coast is Calling!” | |
July 5th, 2025 | Signal Peak Trail Runs 50K | 24M | Emigrant Gap, CA New Event! | |
September 7th, 2025 | Mammoth Bar Trail Runs Half Marathon | 10K | 5K | Auburn, CA New Event! | |
October 5th, 2025 | Yuba Gold Trail Runs 50K | 35K | Half Marathon | North Bloomfield, CA Est. 2019 |
Independent Adventures
Sometimes referred to as Hybrid or Self-Guided, these are essentially D.I.Y. events. Go out and complete the course on your own, with friends if you like, and/or with aid provided by friends.
Afterward, submit your results and activity link via Ultrasignup for proof of completion, and you’ll receive a finisher award and rank in the results.
For each of these, you will have an entire month (or longer) to get it done in. In other words, you choose when you’ll run the course—it just has to be run continuously (all in one go) and within the specified time period.
Fatass Events
These are organized by SBR’s RD.
April 19th, 2025 | Cool-Auburn Pub Run 35K | Cool, CA 10 drink stops over 21.75 mi. | |
October 25th, 2025 | The Rubicon Three Rugged Distances | Oxbow Reservoir, CA Coming soon! |
More Events
SBR’s RD assists with these events.
May 10th, 2025 | Conquer the Wall Marathon | Half Marathon | 10K | 5K | The Great Wall of China |
Recommended Events
August: Desolate Peaks (fatass*)
October: Mile Madness (formerly Ride to Walk)
October: Tony & Phil’s Folsom Firkin Run (fatass*)
October: Euchre Bar Massacre (fatass*)