Run This

Race calendar

Running Races in Thornton, CO

9 upcoming races in and around Thornton. Run This events are listed first — jump to a specific distance below.

Sort
Search all races
DistanceAll5K10KHalf Marathon
Nearby citiesDenverColorado SpringsCentennialFort CollinsLittletonArvadaWestminsterPuebloAuroraBoulderGrand JunctionLoveland

9 races

Wed, Aug 26, 2026

Adams 12 MS XC

Thornton, CO

Outside2.0 mi

Sat, Aug 29, 2026

RMRR Fall Marathon Training Series

Thornton, CO

Outside10.0 mi20.0 mi

Sat, Sep 12, 2026

RMRR Fall Marathon Training Series #2

Thornton, CO

Outside12.4 mi18.6 mi

Sat, Sep 12, 2026

RMRR September 5k/10k

Thornton, CO

Outside10K5K

Sat, Sep 26, 2026

RMRR Fall Marathon Training Series #3

Thornton, CO

Outside10.0 mi20.0 mi

Fri, Oct 2, 2026

I Can 5k

Thornton, CO

Outside5K

Fri, Oct 30, 2026

I Ain't Scared (of 5k)

Thornton, CO

Outside5K

Fri, Dec 11, 2026

WinterFest 5k & Fun Run

Thornton, CO

Outside5K1200 m

Fri, Jun 18, 2027

Unicorn 5k (North)

Thornton, CO

Outside5K1000 m

Other cities in Colorado

Denver38Colorado Springs34Centennial32Fort Collins17Littleton16Arvada12Westminster12Pueblo9Aurora8Boulder7Grand Junction7Loveland7Windsor6Buena Vista5Durango5Louisville5Steamboat Springs5Bellvue4Golden4Broomfield3Castle Rock3Estes Park3Greeley3Highlands Ranch3Manitou Springs3Pagosa Springs3Palmer Lake3Parker3Pine3