5K races in Colorado, United States — 2026 running calendar

12th Annual Run for the Ring

Aurora, Colorado, United States

01 Aug, 2026 (Sat)

$35.00 - $37.00

Running

5K

Unicorn 5k (South)

Highlands Ranch, Colorado, United States

01 Aug, 2026 (Sat)

$41.00

Running

5K

Eltuck Valley 5K - Lory Summer Trail Series

Fort Collins, Colorado, United States

04 Aug, 2026 (Tue)

$25.00

Running

5K

Choice City Running Festival

Fort Collins, Colorado, United States

07 Aug, 2026 (Fri) – 08 Aug, 2026

Free - $71.00

Running

1.6K 5K 10K Half-Marathon +4

RMRR August Trophy Series

Centennial, Colorado, United States

07 Aug, 2026 (Fri)

$10.00

Running

5K

Summer Sizzler- Denver

Thornton, Colorado, United States

08 Aug, 2026 (Sat)

$22.00 - $36.00

Running

1.6K 5K 10K 15K

Arapahoe Warrior 5K

Centennial, Colorado, United States

08 Aug, 2026 (Sat)

$27.50

Running

5K

All-Out Runapalooza

Arvada, Colorado, United States

08 Aug, 2026 (Sat)

$40.00 - $353.00

Running

Half-Marathon 10K 5K +2

Pancake Stampede 5K

Littleton, Colorado, United States

09 Aug, 2026 (Sun)

$20.00

Running

5K

The Bullfrog Summer Surge

Lakewood, Colorado, United States

09 Aug, 2026 (Sun)

Free - $40.00

Running

5K 0.8K

Summer Sizzler- Colorado Springs

Colorado Springs, Colorado, United States

09 Aug, 2026 (Sun)

$22.00 - $34.00

Running

1.6K 5K 10K 15K

Sunrise Stampede

Longmont, Colorado, United States

15 Aug, 2026 (Sat)

Free - $35.00

Running

5K 1.6K +1