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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75 races within 25 mi of Boulder, CO
Arvada, CO14 mi away
Good weather · 71/100 Typical: 43° / 23°F · 20% rain
Lyons, CO14 mi awayRegistration opens Dec 11, 2026
Tough weather · 40/100 Typical: 27° / 9°F · 38% rain
Arvada, CO19 mi away
Fair weather · 66/100 Typical: 40° / 20°F · 20% rain
Golden, CO22 mi away
Fair weather · 65/100 Typical: 40° / 19°F · 17% rain
18% faster times (mile)past finishers
Westminster, CO16 mi away
Fair weather · 66/100 Typical: 44° / 21°F · 26% rain
Lyons, CO19 mi away
Good weather · 73/100 Typical: 43° / 21°F · 27% rain
Arvada, CO19 mi away
Fair weather · 66/100 Typical: 44° / 21°F · 26% rain
6% slower times (5K)past finishers
Arvada, CO19 mi away
Good weather · 75/100 Typical: 44° / 21°F · 26% rain
Westminster, CO16 mi away
Good weather · 78/100 Typical: 54° / 28°F · 24% rain
11% slower times (8K)past finishers
Golden, CO14 mi away
Fair weather · 64/100 Typical: 40° / 17°F · 39% rain
5% faster times (half)past finishers
Arvada, CO14 mi away
Ideal weather · 92/100 Typical: 60° / 32°F · 28% rain
Westminster, CO16 mi away
Ideal weather · 91/100 Typical: 63° / 35°F · 36% rain
4% faster times (5K)past finishers
Golden, CO22 mi away
Good weather · 81/100 Typical: 60° / 32°F · 32% rain
6% faster times (5K)past finishers
Boulder, CO8 mi awayRegistration opens Jan 1, 2027
Ideal weather · 88/100 Typical: 65° / 38°F · 39% rain
Longmont, CO19 mi away
Ideal weather · 90/100 Typical: 65° / 38°F · 39% rain
Superior, CO11 mi away
Good weather · 81/100 Typical: 65° / 38°F · 39% rain
Westminster, CO16 mi away
Ideal weather · 90/100 Typical: 68° / 40°F · 40% rain
Boulder, CO7 mi away
Ideal weather · 89/100 Typical: 80° / 51°F · 32% rain