Half Marathon Races in Colorado

Find upcoming half marathon races in Colorado — with dates, locations, and direct registration links.

66 upcoming half marathon races found in Colorado

Upcoming Half Marathon Races in Colorado

Half Marathon+5

Dec 5

All-Out Fa La La

Sat, December 5, 2026

Westminster, CO

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Half Marathon+5

Nov 1

All-Out Kooky-Spooky

Sun, November 1, 2026

Golden, CO

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Half Marathon+5

Aug 7

All-Out Runapalooza

Sat, August 7, 2027

Arvada, CO

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Half Marathon+3

Sep 18

Autumn Run

Sat, September 18, 2027

Buena Vista, CO

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Blue Sky Trail Marathon+1

Oct 17

Blue Sky Trail Marathon & Half Marathon

Sat, October 17, 2026

Fort Collins, CO

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Marathon+4

Aug 1

Bound for Boston Marathon & Half Marathon - Denver

Sun, August 1, 2027

Denver, CO

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Half Marathon+1

Aug 21

Byers Peak Stampede Half Marathon & 5K Run

Sat, August 21, 2027

Fraser, CO

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Durango Marathon+2

Oct 11

Durango Marathon

Sun, October 11, 2026

Durango, CO

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Half Marathon+1

Aug 15

Erie Half & 5k

Sun, August 15, 2027

Erie, CO

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Kid's Dash+7

Sep 11

Golden Harvest Half Marathon & 5k/10k - Denver

Sat, September 11, 2027

Denver, CO

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Half Marathon

Nov 7

HRCA Backcountry Wilderness Half Marathon

Sat, November 7, 2026

Lone Tree, CO

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Half Marathon+3

Sep 6

Labor Day Half Marathon

Mon, September 6, 2027

Parker, CO

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Half Marathon+2

Aug 22

Pioneer Prairie Dog Half, 10k & 5k

Sun, August 22, 2027

Westminster, CO

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5k run or walk+5

Jun 19

Red, White and Brew 5k, 10k & Half Marathon

Sat, June 19, 2027

Windsor, CO

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Half Marathon+2

Aug 7

Sheep Mountain Trail Runs

Sat, August 7, 2027

Fairplay, CO

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1 Mile+9

Oct 31

Spooky Sprint - Colorado Springs

Sat, October 31, 2026

Colorado Springs, CO

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The Long View Marathon+2

Oct 10

The Long View Marathon

Sat, October 10, 2026

Fort Collins, CO

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Marathon+3

Jun 6

The Steamboat Marathon

Sun, June 6, 2027

Steamboat Springs, CO

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Kids Dash+10

Nov 8

Turkey Trails - Colorado Springs

Sun, November 8, 2026

Colorado Springs, CO

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Kid's Dash+9

Nov 7

Turkey Trails- Denver

Sat, November 7, 2026

Denver, CO

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Half Marathon+1

Oct 11

Westy Half & 5k

Sun, October 11, 2026

Westminster, CO

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Windsor Marathon+4

Oct 4

Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile Run

Sun, October 4, 2026

Windsor, CO

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Half Marathon+5

Feb 6

All-Out Mardi Crawl

Sat, February 6, 2027

Arvada, CO

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Half Marathon+5

Jan 9

All-Out Polar Prowl

Sat, January 9, 2027

Arvada, CO

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5K+8

Jul 31

Popsicle 5K/10K/Half - Colorado Springs

Sat, July 31, 2027

Colorado Springs, CO

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Half Marathon+6

Jun 26

Slacker Half Marathon-Relay-4-Mile Races

Sat, June 26, 2027

Georgetown, CO

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Stories 6-Hour+6

Feb 6

Stories Trail Runs

Sat, February 6, 2027

Colorado Springs, CO

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A Run Through Time Trail Marathon+2

Mar 13

22nd Annual Run Through Time Trail Marathon and Half Marathon

Sat, March 13, 2027

Salida, CO

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Marathon+3

Nov 9

2026 Southwest Series - Day 2 (CO)

Mon, November 9, 2026

Durango, CO

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Half Marathon+5

Apr 24

All-Out Beat the Heat

Sat, April 24, 2027

Westminster, CO

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