The Rubicon

The Rubicon

The Rubicon is a remote on and off trail foot race in the backcountry of the northwestern Sierra Nevada, near Oxbow Reservoir, CA and Blacksmith Flat Spur (FS Rd 23-002). The event date is Saturday, Oct 24, 2026. The course runs across rough terrain and includes multiple water crossings.

This is not an official event. Organizers describe it as a fatass, a glorified group run. There will be no course markings, no aid stations, no staff, and no medical team. The undertaking is presented as very difficult and should be treated as a self-supported backcountry endeavor.

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

Completion requirements are specified: 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. Registration closes on Thu, Oct 22, 2026. Updates are posted in a Facebook group maintained for the event. Visit the organization's website for the most recent information.