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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.

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DistanceAll5K10KHalf Marathon
Nearby citiesDenverColorado SpringsCentennialLittletonFort CollinsArvadaWestminsterPuebloBoulderLovelandDurangoGrand Junction

9 races

Fri, Aug 7, 2026

Summer Sizzler- Denver

Thornton, CO

Outside50 m1 mile5K10K

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

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