Running races in Denver 2026: calendar, dates and registration

Upcoming races

• Sat, Oct 17Indian Creek Trail RunsPine Nook · 8 km
• Sat, Oct 17Spooky Sprint 5kThornton · 5 km
• Sat, Oct 17Trail Apples 4, 8, or 12 miles11500 N Roxborough Park Road · Trail Running
• Sun, Oct 18Denver Marathon 2026Denver · 42.2 km
• Sat, Oct 24MonsterDASH Run - DenverDenver · 5 km
• Sat, Oct 24Race to Cure Sarcoma - DenverDenver · 5 km

Questions about races in Denver

Does the calendar cover only the city of Denver?

It includes races in and around Denver, within 70 km. Each event page names the starting town; check it before planning your trip. Counts reflect the listed races, rather than every race that may exist.

Where can I check registration?

Open the event page and follow the organizer or registration link when available. Check places, price, start time and rules there; a calendar listing does not mean entries are still available.

How do the distance filters work?

5K and 10K show distances close to 5 and 10 km; half and marathon show distances close to 21.1 and 42.2 km. Trail groups mountain races. Races without a published distance appear under All.