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Running Calendar near Fort Collins 2025-2026

Explore the top running races near Fort Collins for 2025-2026! We've gathered 30 exciting races in the area. Check out our detailed list below to find your next local race.

August 2025
Aug
1-2
Fr - Sa

Rocky Mountain Half Marathon

5 km 13 mi
Aug
2
Saturday

Valley 5K

5 km
Aug
5-26
Tu - Tu

Lory Summer Trail Series

Trail Run 5 km 10 km 12 km
Aug
5
Tuesday

Eltuck Valley 5K

Trail Run 5 km
Aug
8-9
Fr - Sa

Choice City Running Festival

5 km 10 km 13 mi
Aug
9
Saturday

Dog Days of Summer

3 mi
Aug
12
Tuesday

Into The Hills Eltuck 10K

Trail Run 10 km
Aug
16
Saturday

Longmont Try-A-Tri

Triathlon
Aug
19
Tuesday

Into The Hills Eltuck 5K

Trail Run 5 km
Aug
26
Tuesday

Eltuck Valley 12K Trail Series

Trail Run 12 km
Aug - Sep
28-1
Th - Mo

Front Range Ultra Dayze

Trail Run 50 km 12 hr ... 72 hr 100 hr
September 2025
Sep
5-6
Fr - Sa

American Heroes Run

Trail Run 5 km 9 mi ... 100 mi 24 hr
Sep
6
Saturday

Black Squirrel Half

Trail Run 13 mi
Sep
14
Sunday

Fall Equinox Marathon

5 mi 13 mi 26 mi
October 2025
Oct
4
Saturday

Rocky's Backyard Ultra

Backyard Ultra 4 mi
Oct
5
Sunday

Windsor Marathon

5 km 10 km 13 mi 26 mi
Oct
11
Saturday

The Long View Marathon

5 km 13 mi 26 mi
Oct
18-19
Sa - Su

Blue Sky Trail Marathon

Trail Run 13 mi 26 mi
November 2025
Nov
1-2
Sa - Su

Colorado 24 Hour Run

Backyard Ultra 6 hr 12 hr 24 hr
Nov
8
Saturday

Bell Ringer 4 Miler

4 mi
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