Colorado Triathlon Calendar 2025-2026

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Explore the best triathlons in Colorado for 2025-2026! Our updated list features 318 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

March 2025
Mar
15
Saturday

Erin Go Bragh 7.77k

7 km
Mar
15
Saturday

Sharin' O' The Green

5 km
Mar
15
Saturday

HRCA St. Patrick's Day 5K

5 km
Mar
15
Saturday

Luck of the Irish 7k

7 km
Mar
16
Sunday

Lucky Brew Race 15K

15 km
Mar
16
Sunday

Lucky Leprechaun 5K

5 km
Mar
22
Saturday

Trail Apples

Trail Run
Mar
23
Sunday

All-Out Spring Fever

5 km 10 km 13 mi
Mar
23
Sunday

Central Park 5k

5 km
Mar
23
Sunday

RMRR Spring Marathon Training Series

10 mi 20 mi
Mar
29
Saturday

CupCake 5k

5 km
April 2025
Apr
4-5
Fr - Sa

Run The Ranch

Trail Run 5 km 10 km ... 6 hr 12 hr
Apr
5
Saturday

Dialysis Dash

5 km
Apr
5
Saturday

Founders Day 5k Color Run

Apr
6
Sunday

Donut Dash - Denver

5 km
Apr
6
Sunday

RMRR Trophy Series

4 mi
Apr
11-13
Fr - Su

Desert Rats Trail Running Festival

Trail Run 10 km 21 km 50 km 100 km
Apr
11
Friday

Denver Distance Classic

3 km
Apr
12
Saturday

Boulder Rez Half

5 km 10 km 13 mi
Apr
13
Sunday

Spring Fling Prairie Dog Half Marathon

5 km 10 km 13 mi
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