EVENTS

September 2025

Sun 7

September 7 @ 7:00 am - 4:00 pm

Horsetooth Open Water Swim 2026

Horsetooth Reservoir 1087 county road 23, fort collins, CO, United States

Horsetooth Open Water Swim
September 6th, 2026
Fort Collins, Colorado

$20 – $110

Wed 10

September 10 @ 9:00 am - 9:30 am

Northridge Elementary Fun Run

Northridge Elementary School 555 Southpark Road, Highlands Ranch, CO

Northridge Elementary
September 10, 2025
Highlands Ranch, CO

Wed 10

September 10 @ 9:00 am - 9:30 am

Northridge Elementary Fun Run 2026

Northridge Elementary School 555 Southpark Road, Highlands Ranch, CO

Northridge Elementary
September 9th, 2026
Highlands Ranch, CO

Sat 13

September 13 @ 8:00 am - 8:30 am

NedNed Trail Fest 2025

Nederland, CO

NedNed Trail Fest
September 13th, 2025
Nederland, CO

$35 – $85

Sat 13

September 13 @ 8:00 am - 8:30 am

NedNed Trail Fest 2026

Nederland, CO

NedNed Trail Fest
September 12th, 2026
Nederland, CO

$35 – $85

Sat 13

September 13 @ 9:00 am - 9:20 am

Heroes and Villains Team Hope 5K Walk and Run

Central Park Central Park Blvd & MLK Jr. Pkwy, Denver, Colorado

Heroes vs Villains 5K
September 13th, 2025
Denver, CO

Sat 13

September 13 @ 9:00 am - 9:20 am

Heroes and Villains Team Hope 5K Walk and Run 2026

Central Park Central Park Blvd & MLK Jr. Pkwy, Denver, Colorado

Heroes vs Villains 5K
September 12th, 2026
Denver, CO

Sun 14

September 14 @ 7:00 am - 8:00 am

Nun Run Half Marathon, 5K & 1 Mile 2025

DeKoevend Park

Nun Run
September 14th, 2025
Littleton, Colorado

$30 – $60

Sun 14

September 14 @ 7:00 am - 8:00 am

Nun Run Half Marathon, 5K & 1 Mile 2026

DeKoevend Park

Nun Run
September 13th, 2026
Littleton, Colorado

$30 – $60

Sun 14

September 14 @ 7:00 am - 12:00 pm

Lead King Loop Charity Races 2025

Thompson Park 2nd & Main Street, Marble

Lead King Loop 25K
September 14th, 2025
Marble, Colorado

$65 – $85