Trail Races & Ultramarathons Near San Francisco, CA
As of October 6, 2026, Crewable lists 35 upcoming trail races and ultramarathons near San Francisco, CA from October 2026 to August 2027. The next is Mountain Tiger Diablo on October 10 in Clayton, CA. Registration is open for 8.
Sources: UltraSignup, RunSignUp, UTMB, race organizers and race websites
Race calendar
October 2026
8 racesNovember 2026
7 racesNomadic 5K Trail Run
Walnut Creek, CA
December 2026
6 racesJanuary 2027
2 racesFebruary 2027
2 racesMarch 2027
3 racesApril 2027
1 raceMay 2027
4 racesJune 2027
1 raceAugust 2027
1 raceQuick answers
What is the next trail race or ultramarathon near San Francisco, CA?
Mountain Tiger Diablo, on Saturday, October 10, 2026, in Clayton, CA. Distances: 12 mi.
What is the closest trail race or ultramarathon to San Francisco?
Hunter S. Thompson Fear & Loathing in San Francisco, CA, about 2 miles from San Francisco, on December 6, 2026.
How many trail races and ultramarathons near San Francisco, CA have open registration?
8 of the 35 list registration as open as of October 6, 2026, including Sonoma Fall Classic, Oakland Hills Trail Run and ZombieRunner Halloween.
How many of the trail races near San Francisco, CA are ultramarathons?
19 of the 35 are ultramarathons (longer than a marathon, or a backyard, timed or 200+ mile format). The other 16 are shorter races.
What is the busiest month for trail races and ultramarathons near San Francisco, CA?
October 2026, with 8 of the 35. November 2026 follows with 7.
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