Upcoming Marathon Races Near Thornton, CO

Name: The Colorado Marathon
Start: 2026-05-03
End: 2026-05-03
Location: Fort Collins

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Fall Equinox

Fort Collins, CO

Sunday, September 14th, 2025

Marathon

Half

Fast

View details for race Fall Equinox

Sloan's Lake Search Party (SLSP) Marathon Hourl...

Denver, CO

Sunday, September 14th, 2025

Marathon

View details for race Sloan's Lake Search Party (SLSP) Marathon Hourly Loop Race!

Windsor Marathon, Half Marathon, 10k & 5k

Windsor, CO

Sunday, October 5th, 2025

Marathon

Half

10K

Trail

View details for race Windsor Marathon, Half Marathon, 10k & 5k

The Long View Marathon

Fort Collins, CO

Saturday, October 11th, 2025

Marathon

Half

View details for race The Long View Marathon

Blue Sky Marathon & Half

Fort Collins, CO

Saturday, October 18th, 2025

Half

Marathon

View details for race Blue Sky Marathon & Half

Runs With Scissors Races

Brighton, CO

Saturday, April 25th, 2026

Half

Marathon

Ultra

View details for race Runs With Scissors Races

The Colorado Marathon

Fort Collins, CO

Sunday, May 3rd, 2026

Marathon

Half

10K

View details for race The Colorado Marathon

Explore more in Thornton, CO

Distances:

5K 10K Half Marathon Marathon

Months:

August September October

Tags:

Trail Boston Qualifiers Fast Courses

State:

All Colorado races

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