1 aid100 Mile Races in California
As of October 6, 2026, Crewable lists 12 upcoming 100 mile races in California from October 2026 to June 2027. The next is Cahuilla Rez Ultra on October 17 in Anza. Registration is open for 3. One advertises prize money.
Sources: UltraSignup, RunSignUp, UTMB, race organizers and race websites
With aid station data
1 aid
9 aid
5 aid
21 aid
5 aid
5 aidin 18 days
Island View - Endurance Run
Goleta, CA24,059 ft gain
100 mi100K+1Prize money
Open until Oct 20from $75
Race calendar
October 2026
3 racesNovember 2026
1 raceFebruary 2027
1 raceApril 2027
4 racesJune 2027
3 racesQuick answers
What is the next 100 mile race in California?
Cahuilla Rez Ultra, on Saturday, October 17, 2026, in Anza. Distances: 100 mi, 24 hr, 12 hr.
How many 100 mile races in California have open registration?
3 of the 12 list registration as open as of October 6, 2026, including Sonoma Fall Classic, Island View - Endurance Run and Boundiful Endurance Runs.
Which 100 mile races in California offer prize money?
One race advertises prize money.
What is the busiest month for 100 mile races in California?
April 2027, with 4 of the 12. October 2026 follows with 3.
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