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 Lone Tree, CO
Denver, CO16 mi away
Fair weather · 59/100 Typical: 91° / 62°F · 35% rain
6% slower times (half)past finishers
Castle Rock, CO11 mi away
Fair weather · 62/100 Typical: 88° / 59°F · 44% rain
Golden, CO22 mi away
Good weather · 72/100 Typical: 86° / 59°F · 52% rain
Denver, CO17 mi awayRegistration opens Dec 1, 2026
Harsh weather · 32/100 Typical: 88° / 62°F · 46% rain
Denver, CO16 mi away
Good weather · 74/100 Typical: 88° / 61°F · 39% rain
8% slower times (5K)past finishers
Highlands Ranch, CO2 mi away
Good weather · 76/100 Typical: 85° / 58°F · 48% rain
11% slower times (5K)past finishers
Denver, CO16 mi away
Good weather · 82/100 Typical: 81° / 53°F · 25% rain
Lakewood, CO17 mi away
Ideal weather · 90/100 Typical: 79° / 50°F · 23% rain
Englewood, CO3 mi awayRegistration opens Jan 11, 2027
Ideal weather · 99/100 Typical: 72° / 43°F · 17% rain
Sedalia, CO24 mi awayRegistration opens Dec 1, 2026
Ideal weather · 99/100 Typical: 64° / 36°F · 16% rain
Littleton, CO8 mi away
Ideal weather · 95/100 Typical: 64° / 36°F · 16% rain
Lakewood, CO19 mi awayRegistration opens Nov 1, 2026
Ideal weather · 99/100 Typical: 64° / 36°F · 16% rain
7% slower times (10 mi)past finishers