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Running Calendar near Thornton 2026-2027

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Explore the top running races near Thornton for 2026-2027! We've gathered 180 exciting races in the area. Check out our detailed list below to find your next local race.

Half Marathons Marathons Trail Runs Triathlons
September 2026
Sep
26
Sa

The Best Races - Centennial

Race Roster Road Race 5 km 10 km 13 mi
The Best Races - Centennial
Sep
26
Sa

The Best Races - Foxfield

Race Roster Road Race 5 km 10 km 13 mi
The Best Races - Foxfield
Sep-Oct
26-3
Sa

Runway 5K - Run for the Angels

5 km
Sep
26
Sa

Parker Parks and Recreation so Long to Summer

5 km 10 km
Sep
26
Sa

Lisa Nelson's Mustang Stampede 5K

Road Race 5 km
Monthly updates for Thornton

Get new running races (and updates) in your inbox every month.
Sep
27
Su

Run Boulderthon: The Boulder Marathon

5 km 10 km Half Marathon Marathon
Sep
27
Su

Flyin' Lion 5K - Littleton

5 km
October 2026
Oct
3
Sa

I Can 5k

5 km
Oct
3-4
Sa - Su

The Bear Chase

Trail Run 5 km 10 km ... 50 mi 100 km
Oct
3
Sa

HRCA Wildcat Mountain Trail Race

Trail Run 2 mi 10 km 10 mi
Oct
3
Sa

Spooky Sprint - Denver

3 mi 6 mi 13 mi
Oct
3
Sa

Pretzel Run

5 km 10 km Half Marathon
Oct
3
Sa

Lafayette Music Fest 10K

5 km 10 km
Oct
3
Sa

PRA Miner Gold Rush

5 km
Oct
3
Sa

Big Waves Family 5K Run/Walk

5 km
Oct
3
Sa

Outlast Denver

Trail Run 5 km 18 mi
Oct
4
Su

Hot Chocolate Run – Denver

5 km 10 km 15 km
Oct
4
Su

RMRR Trophy Series

5 km 8 mi
Oct
4
Su

Denver Run/Walk

Road Race 5 km
Oct
7-12
We - Mo

Your Story Isn't Over 10K

Road Race 5 km 10 km
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