Race catalog · Updated nightly
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59 races within 25 mi of Union City, CA
Castro Valley, CA11 mi away
Ideal weather · 94/100 Typical: 56° / 39°F · 29% rain
22% slower times (half)past finishers
Castro Valley, CA11 mi away
Ideal weather · 94/100 Typical: 56° / 39°F · 29% rain
Mountain View, CA12 mi away
Ideal weather · 90/100 Typical: 56° / 39°F · 29% rain
Alameda, CA14 mi away
Ideal weather · 93/100 Typical: 57° / 40°F · 25% rain
Woodside, CA16 mi away
Ideal weather · 92/100 Typical: 56° / 47°F · 29% rain
San Francisco, CA25 mi awayRegistration opens Oct 27, 2026
Ideal weather · 94/100 Typical: 57° / 44°F · 29% rain
Fremont, CA3 mi away
Ideal weather · 94/100 Typical: 58° / 40°F · 30% rain
9% slower times (5K)past finishers
Pacifica, CA22 mi away
Ideal weather · 91/100 Typical: 56° / 48°F · 27% rain
San Jose, CA13 mi away
Ideal weather · 94/100 Typical: 62° / 42°F · 30% rain
Oakland, CA15 mi away
Ideal weather · 95/100 Typical: 64° / 43°F · 28% rain
San Francisco, CA25 mi away
Ideal weather · 93/100 Typical: 60° / 46°F · 32% rain
San Francisco, CA24 mi awayRegistration opens Dec 1, 2026
Ideal weather · 97/100 Typical: 62° / 47°F · 21% rain
Berkeley, CA22 mi awayRegistration opens Mar 1, 2027
Ideal weather · 98/100 Typical: 64° / 47°F · 16% rain
Alameda, CA17 mi away
Ideal weather · 99/100 Typical: 64° / 47°F · 16% rain
Castro Valley, CA11 mi away
Ideal weather · 100/100 Typical: 67° / 44°F · 16% rain
San Carlos, CA13 mi away
Ideal weather · 95/100 Typical: 59° / 50°F · 10% rain
7% faster times (trail 5K)past finishers
San Francisco, CA25 mi away
Ideal weather · 99/100 Typical: 67° / 49°F · 9% rain
Saratoga, CA23 mi away
Ideal weather · 99/100 Typical: 71° / 47°F · 8% rain
47% slower times (half)past finishers
Clayton, CA23 mi away
Good weather · 77/100 Typical: 76° / 49°F · 7% rain
21% slower times (trail half)past finishers
Menlo Park, CA11 mi away
Good weather · 81/100 Typical: 72° / 48°F · 7% rain
Oakland, CA16 mi away
Good weather · 73/100 Typical: 78° / 50°F · 5% rain
14% slower times (trail half)past finishers
Castro Valley, CA11 mi away
Ideal weather · 89/100 Typical: 77° / 50°F · 3% rain