The Rubicon

OCT
24
2026
An unofficial, remote backcountry foot event near Oxbow Reservoir, CA. Three self-supported routes from about 15 to 43 miles feature large elevation gain, multiple hill climbs, and water crossings.
Sat 24 Oct 2026
43 kilometers 30 kilometers 15 kilometers

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The Rubicon

The Rubicon is a very difficult and remote on and off-trail foot race in the backcountry of the northwestern Sierra Nevada near Oxbow Reservoir, California. The route runs through rugged terrain and includes multiple hill climbs and water crossings. The event is informal and organized as a fatass group run rather than an official race.

There are no course markings, no aid stations, no event staff, and no medical team. Participants are expected to be self-sufficient on the route. The location references Blacksmith Flat Spur (Forest Service Road 23-002) near Oxbow Reservoir.

Route options are listed below:

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

Completion prerequisites apply: finishing The Requisite is required before attempting The Resonant in the future, and finishing The Resonant is required before attempting The Revenant in the future. Registration closes on Thu, Oct 22 at 11:59 PM PT. Visit the organization's website for the most recent information.

43 km
The Revenant
30 km
The Resonant
15 km
The Requisite
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