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+3,001 ft-3,001 ft32 hours3,367 ft to 4,666 fttech 5/10Checkpoints per race book2-mile loopreal food aidtribal fundraiserOctober
Distance23.9 mi
Gain+3,001 ft
Loss-3,001 ft
Altitude3,367 ft to 4,666 ft
Technicality5/10
Air40°F to 85°F
- Start3,885 ft
- High4,666 ft
- Low3,367 ft
- Finish3,885 ft
Field, 2025 · 2-year samplescraped
Starters20
Finish rate60%
Median27:11
Sub-244
Geometryderived
Steepest drop876 ft-7.0% 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 65)
Course DNA
The Course
Cahuilla Rez Ultra 100 runs 100 mi through Cahuilla Indian Reservation, Anza, California. +3,001 ft gain and -3,001 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 50.
The Work
Train for 3,001 feet of climbing across 100 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 5/10. Build a block that simulates the crux near mile 65.
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 25. 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 50.
Race Day
Hold effort through mile 25. The field often splits on the first big climb after mile 50. Loop 35 at mile 70 when the rolling hills stop being cute near mile 65 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 33 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