Denver close

Trail Running Calendar near Denver 2025-2026

Explore the top trail runs near Denver for 2025-2026! We've gathered 116 exciting races in the area. Check out our detailed list below to find your next local race.

May 2026
May
3
Sunday

Longmont Half

5 km Half Marathon
May
10
Sunday

Colorado Women's Classic

5 km 10 km 10 mi
May
10
Sunday

Bodies Race Company - Broomfield

5 km 10 km Half Marathon
May
15-17
Fr - Su

Denver Colfax Marathon

10 mi 13 mi 26 mi
May
23
Saturday

The Best Races - Centennial

5 km 10 km 13 mi
May
30
Saturday

North Fork 50 Mile

Trail Run 50 km 50 mi
June 2026
Jun
6
Saturday

The Best Races - Centennial

5 km 10 km 13 km
Jun
7
Sunday

Flamingo Day 5K

5 km
Jun
7
Sunday

Colorado 13er Half Marathon

5 km 10 km 13 mi
Jun
13
Saturday

Ironman 70.3 Boulder

Triathlon
Jun
13
Saturday

All-Out Summer Breeze

5 km 10 km Half Marathon
Jun
13
Saturday

Barr Lake Trail Race

Trail Run 3 mi 9 mi ... 18 mi 32 mi
Jun
20
Saturday

Unicorn 5k - Thornton

5 km
Jun
20
Saturday

The Best Races - Centennial

5 km 10 km 13 mi
Jun
21
Sunday

Father's Day Classic 10k

5 km 10 km
Jun
27-28
Sa - Su

Chase the Moon

Backyard Ultra 10 mi 31 mi
July 2026
Jul
4
Saturday

Let Freedom Run 10k - Louisville

5 km 10 km
Jul
4
Saturday

The Best Races - Centennial

5 km 10 km 13 mi
Jul
4
Saturday

Let Freedom Run 5k - Longmont

5 km
Jul
11
Saturday

Cookie Chase

5 km
Articles
Top 10 Marathons in the Netherlands - The Ultimate Dutch Marathon Bucket List: 10 Unmissable Races
The Beauty of the Easy Run - Why slowing down might be the smartest thing you do for your running
Mizuno Wave Rider 28: Elevating the Legacy of a Running Icon
Garmin Forerunner Review: Garmin Forerunner Series