The Rubicon race takes place in Oxbow Reservoir, California on October 24th, inviting runners to test their limits on a challenging course deep within the backcountry of the northwestern Sierra Nevada. This event is not an official competition but rather a fatass event—a group run that requires serious preparation and endurance from participants. The race starts at Blacksmith Flat Spur (FS Rd 23-002) in Oxbow Reservoir, where runners will encounter rugged terrain with no course markings or aid stations to assist them along the way. On race morning, as temperatures hover between an average of 17.9°C and a minimum of 11.0°C, participants can expect varying trail conditions that are firm but slightly soft underfoot due to recent weather patterns. With winds averaging around 7.5 km/h and humidity at about 58%, the atmosphere will be challenging yet manageable for those prepared with proper gear and endurance training. Since its inception, The Rubicon has become a significant undertaking among serious trail runners in Oxbow Reservoir, offering three distinct route options: The Requisite (15+ miles), The Resonant (30+ miles), and the most demanding of all, The Revenant (43+ miles). Each option progressively builds upon previous experiences, requiring participants to first complete less challenging routes before advancing. This event attracts a dedicated community of runners who value pushing their physical limits in one of California's harshest but most scenic landscapes.
The Requisite Start: 07:15:00
The Resonant Start: 07:15:00
Runners must register for the event through the official website at https://ultrasignup.com/register.aspx?did=131592 before the deadline to secure their spot on race day. The registration fee is set but not specified in the provided data, ensuring that participants are financially committed as well as physically prepared. Bib pickup will occur two days prior to the event at a location yet to be announced in Oxbow Reservoir. Participants should bring identification and proof of previous route completion if attempting higher mileage options for The Rubicon. Start location is Blacksmith Flat Spur (FS Rd 23-002), where all runners must adhere strictly to age requirements and show up prepared with necessary gear, such as proper footwear, hydration packs, and emergency supplies. The Rubicon race in Oxbow Reservoir on October 24th offers an unparalleled challenge for seasoned trail runners seeking a true test of endurance amidst the rugged beauty of California’s Sierra Nevada backcountry.
Races Offered
The Requisite
Oct 24, 2026
straighten
Distance —
24.1K
terrain
Type —
Running
timer
07:15
sell
$0.00
The Resonant
Oct 24, 2026
straighten
Distance —
48.3K
terrain
Type —
Running
timer
07:15
sell
$0.00
The Revenant
Oct 24, 2026
straighten
Distance —
69.2K
terrain
Type —
Running
timer
07:15
sell
$0.00
Weather History
These values represent the 3-year monthly averages for October in Oxbow Reservoir.
thermostatTemperature
11.0° / 24.8°
wb_sunnyFeels like
8.5° / 22.5°
light_mode
Avg sunshine hours
9h 33m
water_drop
Avg rainfall
1.4 mm
ac_unit
Avg snowfall
—
air
Avg wind speed
7.5 km/h (Light breeze)
opacity
Sweat loss rate
Moderate
terrain
Course conditions
Firm and slightly soft
sunny
Max UV Index
Moderate (4.0)
humidity_mid
Humidity
58.5%
wb_twilight
Sunrise
07:14
nightlight
Sunset
18:23
Hotels & Places to Stay
Race Results
All-time top performances and historical records for The Rubicon.
Place
Name
Gender
Age
Year
City
Time
🥇
Loren Baker
M
40
'25
—
10:07:11
🥈
Michael Schooler
M
50
'25
—
10:07:14
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