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Obstacle Race Calendar near Frederick 2025-2026

Explore the top obstacle runs near Frederick for 2025-2026! We've gathered 79 exciting races in the area. Check out our detailed list below to find your next local race.

April 2026
Apr
12
Sunday

Spring Fling Prairie Dog Half Marathon

5 km 10 km 13 mi
Apr
18
Saturday

All-Out Beat the Heat

5 km 10 km Half Marathon
Apr
18
Saturday

Great Western Trail Race

Trail Run 5 km 10 km Half Marathon
Apr
25
Saturday

Runs With Scissors Races

Half Marathon Marathon 50 km
Apr
26
Sunday

Unicorn 5k

2 mi 5 km
May 2026
May
3
Sunday

Longmont Half

5 km Half Marathon
May
10
Sunday

Colorado Women's Classic

5 km 10 km 16 km
May
15-17
Fr - Su

Denver Colfax Marathon

5 km 10 mi 13 mi 26 mi
June 2026
Jun
6
Saturday

J-Town Jog 5K

5 km
Jun
7
Sunday

Flamingo Day 5K

5 km
Jun
7
Sunday

Crazy Legs Trail Run

Trail Run 10 km
Jun
13
Saturday

Ironman 70.3 Boulder

Triathlon
Jun
13
Saturday

All-Out Summer Breeze

5 km 10 km Half Marathon
Jun
20
Saturday

Unicorn 5k - Thornton

5 km
Jun
20
Saturday

Red, White and Brew Half Marathon

5 km 10 km Half Marathon 12 hr
Jun
21
Sunday

Father's Day Classic 10k

5 km 10 km
July 2026
Jul
4
Saturday

Let Freedom Run 10k - Louisville

5 km 10 km
August 2026
Aug
16
Sunday

Erie Half

5 km Half Marathon
September 2026
Sep
3-7
Th - Mo

Front Range Ultra Dayze

Trail Run
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