Race catalog · Updated nightly
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Upcoming running, cycling, triathlon and ultra races, updated nightly from RunSignup, BikeReg and ACTIVE. Missing a race? Submit it
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Race catalog · Updated nightly
Upcoming running, cycling, triathlon and ultra races, updated nightly from RunSignup, BikeReg and ACTIVE. Missing a race? Submit it
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91 races within 25 mi of Castro Valley, CA
San Francisco, CA20 mi away
Ideal weather · 93/100 Typical: 58° / 44°F · 31% rain
San Francisco, CA20 mi away
Ideal weather · 93/100 Typical: 58° / 44°F · 31% rain
Tiburon, CA22 mi away
Ideal weather · 93/100 Typical: 58° / 44°F · 33% rain
14% slower times (trail 8K)past finishers
San Francisco, CA20 mi away
Ideal weather · 94/100 Typical: 60° / 46°F · 31% rain
9% faster times (trail half)past finishers
San Jose, CA23 mi away
Ideal weather · 94/100 Typical: 62° / 42°F · 30% rain
San Francisco, CA20 mi away
Ideal weather · 93/100 Typical: 60° / 46°F · 32% rain
San Francisco, CA19 mi away
Ideal weather · 93/100 Typical: 60° / 46°F · 32% rain
Antioch, CA23 mi away
Ideal weather · 94/100 Typical: 65° / 43°F · 28% rain
San Francisco, CA20 mi away
Ideal weather · 93/100 Typical: 61° / 46°F · 30% rain
San Francisco, CA20 mi away
Ideal weather · 93/100 Typical: 61° / 46°F · 30% rain
San Francisco, CA20 mi away
Ideal weather · 97/100 Typical: 62° / 47°F · 21% rain
San Francisco, CA20 mi away
Ideal weather · 97/100 Typical: 62° / 47°F · 21% rain
San Francisco, CA18 mi awayRegistration opens Dec 1, 2026
Ideal weather · 97/100 Typical: 62° / 47°F · 21% rain
Berkeley, CA13 mi awayRegistration opens Mar 1, 2027
Ideal weather · 98/100 Typical: 64° / 47°F · 16% rain
Alameda, CA10 mi away
Ideal weather · 99/100 Typical: 64° / 47°F · 16% rain
Castro Valley, CA0 mi away
Ideal weather · 100/100 Typical: 67° / 44°F · 16% rain
San Francisco, CA20 mi away
Ideal weather · 99/100 Typical: 65° / 48°F · 11% rain
San Carlos, CA20 mi away
Ideal weather · 95/100 Typical: 59° / 50°F · 10% rain
7% faster times (trail 5K)past finishers
San Francisco, CA20 mi away
Ideal weather · 99/100 Typical: 65° / 48°F · 11% rain
San Francisco, CA20 mi away
Ideal weather · 99/100 Typical: 67° / 49°F · 9% rain
San Francisco, CA20 mi away
Ideal weather · 99/100 Typical: 67° / 49°F · 9% rain
El Sobrante, CA21 mi awayRegistration opens Dec 1, 2026
Ideal weather · 97/100 Typical: 67° / 50°F · 8% rain
24% slower times (half)past finishers