Colorado Triathlon Calendar 2025-2026

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Explore the best triathlons in Colorado for 2025-2026! Our updated list features 354 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

December 2025
Dec
13
Saturday

WinterFest 5k

5 km
Dec
13
Saturday

Santa Catch 10k

5 km 10 km
Dec
20
Saturday

Santa's Dash for Cash

5 km
Dec
21
Sunday

Ugly Sweater 5K - Denver

5 km
Dec
27
Saturday

Candy Cane Course - Denver

5 km 12 km
Dec
28
Sunday

Candy Cane Course

5 km 12 km
Dec
31
Wednesday

Resolution Run - Fort Collins

5 km
January 2026
Jan
1
Thursday

Resolute Runner 5k

5 km
Jan
10
Saturday

Polar Prowl

5 km 10 km 13 mi
Jan
24-25
Sa - Su

USCSA Cross Country Ski Racing Festival

Trail Run 3 km 7 km 15 km
February 2026
Feb
14
Saturday

Heart Throb 5K

5 km
Feb
21-22
Sa - Su

Stories Trail Runs

Trail Run 10 km 13 mi ... 15 hr 30 hr
Feb
22
Sunday

Highlands Ranch 5k

5 km
March 2026
Mar
7
Saturday

Winter's End Snowshoe Races

Trail Run 5 km 7 mi 14 mi 26 mi
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