Upcoming 5K Races In Colorado, US in September, 2025

Oak Creek No Fun Run

Oak Creek, CO

Monday, September 1st, 2025

Labor Day Half Marathon

Parker, CO

Monday, September 1st, 2025

RexRun For PAWSitivity 2025 5K Trail Run/Walk

Aurora, CO

Saturday, September 6th, 2025

Denver Rocks Run 5K/10K

Denver, CO

Sunday, September 7th, 2025

Conservation Colorado 5k

Denver, CO

Sunday, September 7th, 2025

Flyin' Lion 5K

Littleton, CO

Sunday, September 7th, 2025

RMRR September Trophy Series

Thornton, CO

Sunday, September 7th, 2025

Parker Parks and Recreation So Long to Summer 5...

Parker, CO

Saturday, September 13th, 2025

Spooky Sprint - Colorado Springs

Colorado Springs, CO

Saturday, September 13th, 2025

All-Out Fall Fest

Westminster, CO

Saturday, September 13th, 2025

National Chocolate Day: Run for Chocolates DENV...

Centennial, CO

Saturday, September 13th, 2025

The Denver 5k

Denver, CO

Saturday, September 13th, 2025

Break Your Neck: Walk, Run, or Roll

Pueblo, CO

Saturday, September 13th, 2025

Spooky Sprint - Denver

Littleton, CO

Sunday, September 14th, 2025

Spooky Sprint - Denver

Denver, CO

Sunday, September 14th, 2025

Miles 4 Madison 5K & 1K

Littleton, CO

Saturday, September 20th, 2025

Move Forward 5K & 10K

Denver, CO

Saturday, September 20th, 2025

Rim to Rim Royal Gorge Races: 5K Road Run, Trai...

Canon City, CO

Saturday, September 20th, 2025

Autumn Run

Buena Vista, CO

Saturday, September 20th, 2025

13th Annual Superhero Event

Greeley, CO

Saturday, September 20th, 2025

19th Annual Golden Gallop

Golden, CO

Sunday, September 21st, 2025

Farmers 5000

Wheat Ridge, CO

Sunday, September 21st, 2025

Runway 5K - Run for the Angels

Broomfield, CO

Saturday, September 27th, 2025

Pioneer Prairie Dog Half, 10k & 5k

Westminster, CO

Saturday, September 27th, 2025

National Coffee Day: Run for Coffee DENVER/AURORA

Centennial, CO

Saturday, September 27th, 2025

National Singles Day: Singles & Friends Running...

Centennial, CO

Saturday, September 27th, 2025