Upcoming 5K Races Near Longmont, CO in October, 2025

Flyin' Ryan Memorial 5k

Greeley, CO

Friday, October 3rd, 2025

I Can 5k

Thornton, CO

Saturday, October 4th, 2025

Not So Flatt Breast Cancer Awareness Run/Walk

Westminster, CO

Saturday, October 4th, 2025

Big Waves Family 5K run/walk Whiteout Presented...

Westminster, CO

Saturday, October 4th, 2025

Windsor Marathon, Half Marathon, 10k & 5k

Windsor, CO

Sunday, October 5th, 2025

RMRR October Trophy Series

Aurora, CO

Sunday, October 5th, 2025

Layafette Music Fest Half-Marathon/10K/5K

Louisville, CO

Sunday, October 5th, 2025

The Long View Marathon

Fort Collins, CO

Saturday, October 11th, 2025

Gummball 5K

Brighton, CO

Saturday, October 11th, 2025

Joy & Justice 5k

Timnath, CO

Sunday, October 12th, 2025

The bRUNch Run™

Denver, CO

Sunday, October 12th, 2025

Westy Half & 5k

Westminster, CO

Sunday, October 12th, 2025

2025 DU Crimson Classic 5K Run/1.5 Mile Walk

Denver, CO

Tuesday, October 14th, 2025

Homecoming 5k - Colorado State University

Fort Collins, CO

Saturday, October 18th, 2025

The Great Trailhead Foot Race 10 Miler & 5k

Lakewood, CO

Saturday, October 18th, 2025

Apex Foundation Trick or Trot 5K & Kids' Hallow...

Arvada, CO

Saturday, October 25th, 2025

Race to Cure Sarcoma Denver

Denver, CO

Saturday, October 25th, 2025

Ghosts and Goblins 5K/10K

Denver, CO

Sunday, October 26th, 2025