Races
Cahuilla Rez Ultra 100
Fifty laps of reservation double-track. Real burgers at the softball field. Eight thousand five hundred feet of subtle vert. Mind game in mountain desert air.
23.9 mi+3,251 ft-3,251 ft32 hours3,367 ft to 4,666 fttech 7/106 stations2-mile loopreal food aidtribal fundraiserOctober
Distance23.9 mi
Gain+3,251 ft
Loss-3,251 ft
Altitude3,367 ft to 4,666 ft
Technicality7/10
Air40°F to 85°F
- Start3,885 ft
- High4,666 ft
- Low3,367 ft
- Finish3,885 ft
- Cahuilla Indian Reservation at mile 0.0
- California at mile 4.8, cutoff 6.4 hours
- Cahuilla Rez Ultra 100 mile 10 at mile 9.6, cutoff 12.8 hours
- Cahuilla Rez Ultra 100 mile 14 at mile 14, cutoff 19.2 hours
- Cahuilla Rez Ultra 100 mile 19 at mile 19, cutoff 25.6 hours
- Finish Anza at mile 24, cutoff 32 hours
Field, 2025 · 2-year sampleresults
Starters20
Finish rate60%
Median27:11
Sub-244
Geometrycourse math
Steepest drop837 ft-6.6% over 2.4 mi
Night miles13 misunset near 17:00 local
Course records
Men22:29:57Alex Esquivel
Women20:26:20Arcy Selk
The cruxLoop 35 at mile 70 when the rolling hills stop being cute (near mile 16)
Course DNA
The Course
Cahuilla Rez Ultra 100 runs 23.9 mi through Cahuilla Indian Reservation, Anza, California. +3,251 ft gain and -3,251 ft loss. Surfaces skew 100% double-track dirt. Loop 35 at mile 70 when the rolling hills stop being cute. High point near 4,666 ft. Low near 3,367 ft. October temps run 40°F to 85°F. The course rewards patience early and punishes rushed descents after mile 12.
The Work
Train for 3,251 feet of climbing across 23.9 mi. Back-to-back long runs on similar surfaces. Practice power-hiking grades above 15 percent. 32 hours total means limited margin: rehearse fueling every 45 to 60 minutes and downhill eccentric work weekly. Technicality 7/10. Build a block that simulates the crux near mile 16.
Kit
October in Cahuilla Indian Reservation, Anza, California: plan for 40°F to 85°F. Mandatory shell if rain is in forecast. Headlamp with spare batteries if 32 hours pushes past dark. Poles help on sustained climbs above mile 6. Vest capacity for 2 liters minimum. Shoes matched to 100% double-track dirt: lugs for mud, rock plate if the course turns technical after mile 12.
Race Day
Hold effort through mile 6. The field often splits on the first big climb after mile 12. Loop 35 at mile 70 when the rolling hills stop being cute near mile 16 is where time is won or lost. Walk the steep pinches. Run the flats and gentle downhills. Crew at major aids: socks, calories, ice if hot. Transitions under 5 minutes when possible. Final third is 8 miles of fatigue management. Finish with reserve for the last descent.
Results
Cahuilla Rez Ultra 100 finish lines.
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Sources (1)
- Field stats (2025): https://ultrasignup.com/results_event.aspx?did=120355