100 mile races in California

The 24 100 mile ultramarathons in California, with each one's climb, cutoff and date. Every race links to its own page, where you can see how it fits the runner you are now.

Race	Distance	Where	Date	Climb	Cutoff
Mile Madness Endurance Run	100 Miles	Auburn, CA	Sep 19, 2026	—	48 h
Angeles Crest 100 Mile	100 Miles	Wrightwood, CA	Oct 3, 2026	19,869 ft	33 h
Kodiak Ultra Marathons	100 Miles	Big Bear Lake, CA	Oct 9, 2026	15,912 ft	36 h
Cahuilla Rez Ultra	100 Miles	Anza, CA	Oct 17, 2026	8,500 ft	29 h
Sonoma Fall Classic	100 Miles	Healdsburg, CA	Oct 17, 2026	25,058 ft	36 h
San Diego 100 Mile Endurance Run	100 Miles	Escondido, CA	Oct 23, 2026	—	30 h
Island View - Endurance Run	100 Miles	Goleta, CA	Oct 24, 2026	25,000 ft	36 h
Machete Muertos 200	100 Miles	Perris, CA	Oct 28, 2026	—	48 h
Rio Del Lago Race	100 Miles	Granite Bay, CA	Nov 7, 2026	8,176 ft	30 h
Boundiful Endurance Runs	100 Miles	Hemet, CA	Nov 28, 2026	—	31 h
New Year's One Day	100 Miles	San Jose, CA	Dec 31, 2026	—	28 h
Will Rogers 24 Hour/12 Hours/6 Hour	100 Miles	Pacific Palisades, CA	Feb 27, 2027	—	30 h
Run4Kids 24 Hour Running Party	100 Miles	Corona, CA	Apr 16, 2027	—	30 h
Leona Divide Run	100 Miles	Lake Hughes, CA	Apr 17, 2027	16,447 ft	33 h
Silver Moon Race - Kings River	100 Miles	Reedley, CA	Apr 17, 2027	8,750 ft	30 h
Coyote Two Moon Ultras	100 Miles	Ojai, CA	Apr 30, 2027	26,000 ft	42 h
Born to Run Ultra Marathons	100 Miles	Los Olivos, CA	May 14, 2027	—	48 h
Nanny Goat	100 Miles	Riverside, CA	May 22, 2027	—	30 h
Bay Area 100	100 Miles	Oakland, CA	Jun 12, 2027	18,263 ft	33 h
Cool Moon Trail Runs	100 Miles	Cool, CA	Jun 12, 2027	13,600 ft	37 h
Burney Mountain 100	100 Miles	Cassel, CA	Jun 18, 2027	15,000 ft	38 h
Western States 100	100 Miles	Olympic Valley, CA	Jun 26, 2027	15,540 ft	30 h
Folsom 100	100 Miles	Granite Bay, CA	Jul 30, 2027	7,667 ft	38.5 h
Run-de-Vous	100 Miles	San Martin, CA	Aug 20, 2027	—	30 h