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Trail Running Calendar near Thornton 2026-2027

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Explore the top trail runs near Thornton for 2026-2027! We've gathered 26 exciting races in the area. Check out our detailed list below to find your next local race.

December 2026
Dec
12
Sa

Santa Claus Run

Trail Run 5 km 10 km Half Marathon
January 2027
Jan
9
Sa

Frozen Devil’s Head

Trail Run 22 mi
Jan
24
Su

Freakin Freezin 5K - Denver

Trail Run 5 km
February 2027
Feb
6
Sa

Sourdough Snowshoe Race

Trail Run 18 km 30 km
March 2027
Mar
20
Sa

Far Out 3/4 Marathon

Trail Run 5 km 10 mi 32 km
Monthly updates for Thornton

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May 2027
May
1
Sa

Niwot's Challenge

Trail Run 24 mi 50 mi 100 mi
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