10K Races in Colorado
Colorado has 50 upcoming 10K races scheduled for 2026. The calendar runs year-round — busiest in August through October, quietest in March, June, and July. Centennial is the busiest city with 27 races, ahead of Denver (3) and Colorado Springs (2).
10K races by month in Colorado
Aug (11) · Sep (11) · Oct (8) · Nov (8) · Dec (5) · Jan (2) · Feb (2) · Mar (1) · Jun (1) · Jul (1)
Showing 24 of 50
Running
Run for PB& J 5K/10K/13.1 DENVER/AURORA
Centennial, CO
Running
Run for PB& J 5K/10K/13.1 DENVER/AURORA
August 15, 2026
Centennial, CO
Running
Run to Breast Cancer 5K/10K/13.1 DENVER/AURORA
Centennial, CO
Running
Run to Breast Cancer 5K/10K/13.1 DENVER/AURORA
August 30, 2026
Centennial, CO
Running
Golden Harvest Half Marathon & 5k/10k - Colorado Springs
September 6, 2026
Colorado Springs, CO
Running
National Chocolate Day: Run for Chocolates 5K/10K/13.1 DENVER/AURORA
September 12, 2026
Centennial, CO
Top Cities for 10K Races in Colorado
Frequently asked questions
How long is a 10K race?▾
A 10K is 6.2 miles (10 kilometers). It is a popular step-up distance from the 5K and a great intermediate goal for runners building toward a half marathon.
What is the largest 10K in the US?▾
The AJC Peachtree Road Race in Atlanta is the largest 10K in the world, drawing over 60,000 runners every Fourth of July. The BOLDERBoulder in Colorado is another massive 10K with 45,000+ participants.
What is a good 10K time?▾
The average US 10K finish time is around 55-60 minutes. Competitive runners aim for sub-45 minutes, while beginners often target finishing under 1 hour 10 minutes.
How do I train for a 10K?▾
A typical 10K training plan is 8-10 weeks with 3-4 runs per week, including one longer run that builds to 6-7 miles. If you can comfortably run a 5K, you are ready to start training for a 10K.