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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105 races within 25 mi of Sudbury, MA
Wakefield, MA20 mi away
Fair weather · 60/100 Typical: 34° / 19°F · 32% rain
8% faster times (5K)past finishers
Worcester, MA23 mi away
Good weather · 71/100 Typical: 43° / 25°F · 29% rain
7% faster times (5K)past finishers
Westwood, MA14 mi awayRegistration opens Nov 16, 2026
Good weather · 77/100 Typical: 46° / 29°F · 27% rain
Andover, MA24 mi awayRegistration opens Dec 10, 2026
Ideal weather · 90/100 Typical: 53° / 35°F · 37% rain
Hopkinton, MA13 mi away
Good weather · 84/100 Typical: 54° / 36°F · 35% rain
Grafton, MA18 mi away
Ideal weather · 90/100 Typical: 58° / 38°F · 30% rain
Weston, MA5 mi awayRegistration opens Jan 1, 2027
Ideal weather · 92/100 Typical: 58° / 39°F · 37% rain
Canton, MA21 mi awayRegistration opens Jan 4, 2027
Ideal weather · 90/100 Typical: 60° / 40°F · 36% rain
9% faster times (5K)past finishers
Framingham, MA7 mi away
Ideal weather · 91/100 Typical: 61° / 42°F · 38% rain
16% slower times (5K)past finishers
Wakefield, MA20 mi away
Ideal weather · 90/100 Typical: 61° / 43°F · 39% rain
31% faster times (mile)past finishers
Andover, MA23 mi away
Ideal weather · 90/100 Typical: 61° / 43°F · 39% rain
Worcester, MA21 mi away
Ideal weather · 90/100 Typical: 62° / 41°F · 40% rain
9% faster times (5K)past finishers
Grafton, MA18 mi awayRegistration opens Dec 31, 2026
Ideal weather · 90/100 Typical: 64° / 45°F · 40% rain
Lexington, MA10 mi away
Ideal weather · 91/100 Typical: 64° / 45°F · 38% rain
9% faster times (5K)past finishers
Milton, MA20 mi awayRegistration opens Dec 1, 2026
Ideal weather · 91/100 Typical: 66° / 47°F · 38% rain
Arlington, MA14 mi awayRegistration opens Feb 10, 2027
Ideal weather · 91/100 Typical: 65° / 47°F · 37% rain
Boston, MA18 mi away
Ideal weather · 91/100 Typical: 65° / 47°F · 37% rain
Winchester, MA15 mi awayRegistration opens Feb 28, 2027
Ideal weather · 88/100 Typical: 72° / 54°F · 43% rain
6% faster times (8K)past finishers