9 aid100K Races in California
As of October 6, 2026, Crewable lists 15 upcoming 100K races in California from October 2026 to September 2027. The next is HOKA Kodiak Ultra Marathons by UTMB on October 8 in Big Bear Lake. Registration is open for 3. One advertises prize money.
Sources: UltraSignup, RunSignUp, UTMB, race organizers and race websites
With aid station data
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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 racesJanuary 2027
1 raceFebruary 2027
2 racesMarch 2027
2 racesApril 2027
4 racesMay 2027
1 raceJune 2027
1 raceSeptember 2027
1 raceQuick answers
What is the next 100K race in California?
HOKA Kodiak Ultra Marathons by UTMB, on Thursday, October 8, 2026, in Big Bear Lake. Distances: 100 mi, 100K, 50K.
How many 100K races in California have open registration?
3 of the 15 list registration as open as of October 6, 2026, including Island View - Endurance Run, Finish The Ride and Finish The Run Santa Clarita and The Canyons Endurance Runs™ by UTMB®.
Which 100K races in California offer prize money?
One race advertises prize money.
What is the busiest month for 100K races in California?
April 2027, with 4 of the 15. October 2026 follows with 3.
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