The Rubicon

OCT
24
2026
A remote, unmarked backcountry foot race at Oxbow Reservoir, CA offering three long routes from about 15 to 43+ miles with large elevation gains.
Sat 24 Oct 2026
43 miles 30 miles 15 miles

Always double-check with the organizer's website! This page may contain affiliate links.

The Rubicon

The Rubicon is a remote, on- and off-trail foot race held at Oxbow Reservoir, CA and organized by Skybreaker Racing. The event takes place in the backcountry of the northwestern Sierra Nevada and is described by the organizer as very difficult and not to be taken lightly.

This is not an official race. The event is presented as a fatass, a glorified group run. There will be no course markings, no aid stations, no event staff, and no medical team. Participants should plan accordingly.

Route options include:

  • The Requisite: 15+ miles, ≈6,700 ft gain, 3 hill climbs, 2 water crossings
  • The Resonant: 30+ miles, ≈12,700 ft gain, 6 hill climbs, 6 water crossings
  • The Revenant: 43+ miles, ≈19,300 ft gain, 8 hill climbs, 8 water crossings

Progression rules apply: completion of The Requisite is required before attempting The Resonant in the future, and completion of The Resonant is required before attempting The Revenant in the future.

The event is scheduled according to a recurring rule: it falls on the fourth Saturday of October when that month has five Saturdays, otherwise it moves to the first Saturday of October to avoid conflict with another event. Registration closes on Thu, Oct 22 at 11:59 PM PT. Visit the organization's website for the most recent information.

43 mi
The Revenant
30 mi
The Resonant
15 mi
The Requisite

Events nearby

Trail races at Mammoth Bar OHV Area in Auburn State Recreation Area on September 6, 2026. Options include a 13.1 mile half marathon and a 6.2 mile 10K, each with notable elevation gain and staffed aid stations.
Mile Madness is a looped trail endurance event in Auburn, California, held September 18-21, 2026. Timed events run from 3 to 72 hours with a 0.75 mile loop and options including a 100 mile race plus on-site aid and amenities.
Trail half marathon in Auburn, California on September 27, 2026, using the Western States Trail; 12K, 5K, and remote runner options are available.
Yuba Gold is a self guided 50K point to point in Nevada City, CA, completed anytime in October with self reported results and a finisher award.
Add Event
Help us complete the calendar!
  • Distance is at least 5 km
  • Event has a website or Facebook page
Website
Optional: Please provide your e-mail address if we may contact you.
Report a change
We will only update the data if the information is also on the website.