Races
Cool Moon 100
Cool Firehouse. Eight alternating loops through Auburn foothills singletrack. Pig Farm, K2, Olmstead. Heat and vert in the American River canyon.
31.0 mi+6,045 ft-6,045 ft37 hours538 ft to 1,956 fttech 5/10Checkpoints per race bookWestern States trailComstock bucklemulti-loopJune
Distance31.0 mi
Gain+6,045 ft
Loss-6,045 ft
Altitude538 ft to 1,956 ft
Technicality5/10
Air55°F to 95°F
- Start1,742 ft
- High1,956 ft
- Low538 ft
- Finish1,742 ft
Terrain
Field, 2026 · 16-year samplescraped
Starters33
Finish rate52%
Median32:33
Fastest24:26
Geometryderived
Steepest drop968 ft-9.3% over 2.0 mi
Night miles10 misunset near 20:00 local
Weather at the cruxderived
At hour 16 of race, feels like 36 C (97 F).Sample of 7 race days, medium confidence.At hour 16 of race, apparent temperature P90 is 36 C / 97 F.
Course records
Men19:24:45Jake Jackson
Women23:44:24Maddie Mau
The cruxFour North loops with 2,200 feet each (near mile 65)
Course DNA
The Course
Cool Moon 100 runs 100 mi through Cool, California. +6,045 ft gain and -6,045 ft loss. Surfaces skew 86% dirt road / 14% singletrack. Four North loops with 2,200 feet each. High point near 1,956 ft. Low near 538 ft. June temps run 55°F to 95°F. The course rewards patience early and punishes rushed descents after mile 50.
The Work
Train for 6,045 feet of climbing across 100 mi. Back-to-back long runs on similar surfaces. Practice power-hiking grades above 15 percent. 37 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
June in Cool, California: plan for 55°F to 95°F. Mandatory shell if rain is in forecast. Headlamp with spare batteries if 37 hours pushes past dark. Poles help on sustained climbs above mile 25. Vest capacity for 2 liters minimum. Shoes matched to 86% dirt road: 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. Four North loops with 2,200 feet each 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
Cool Moon 100 finish lines.
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Sources (3)
- Field stats (2026): https://ultrasignup.com/results_event.aspx?did=130090
- Course record (M): https://ultrasignup.com/results_event.aspx?did=95850
- Course record (F): https://ultrasignup.com/results_event.aspx?did=117507