Half Marathon Races in Colorado

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

57 upcoming half marathon races found in Colorado

Upcoming Half Marathon Races in Colorado

Half Marathon

Aug 15

Mount Sneffels Marathon & Half Marathon

Sat, August 15, 2026

Ouray, CO

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Half Marathon+2

Aug 15

Endurance Race Series – Westminster 13.1 , 10K, 5K

Sat, August 15, 2026

Westminster, CO

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Half Marathon+1

Aug 16

Erie Half & 5k

Sun, August 16, 2026

Erie, CO

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Half Marathon

Aug 22

Arrowhead Half Marathon

Sat, August 22, 2026

Edwards, CO

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Half Marathon+1

Aug 22

Byers Peak Stampede Half Marathon & 5K Run

Sat, August 22, 2026

Fraser, CO

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Staunton Rocks! Marathon+1

Aug 22

Staunton Rocks! Marathon and Half Marathon

Sat, August 22, 2026

Pine, CO

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Half Marathon+2

Aug 23

Pioneer Prairie Dog Half, 10k & 5k

Sun, August 23, 2026

Westminster, CO

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Kid's Dash+6

Sep 5

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

Sat, September 5, 2026

Denver, CO

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5k+6

Sep 6

Golden Harvest Half Marathon & 5k/10k - Colorado Springs

Sun, September 6, 2026

Colorado Springs, CO

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Half Marathon+3

Sep 7

Labor Day Half Marathon

Mon, September 7, 2026

Parker, CO

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Black Squirrel Half Marathon

Sep 12

Black Squirrel Half Marathon

Sat, September 12, 2026

Bellvue, CO

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Trail Sisters Women's Half Marathon+1

Sep 12

Trail Sisters Women's Half Marathon & 10k

Sat, September 12, 2026

Buena Vista, CO

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Half Marathon+5

Sep 19

All-Out Fall Fest

Sat, September 19, 2026

Westminster, CO

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Half Marathon+3

Sep 19

Autumn Run

Sat, September 19, 2026

Buena Vista, CO

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Half Marathon+3

Sep 20

Fall Equinox

Sun, September 20, 2026

Fort Collins, CO

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Red Feather Trail Jamboree 50 Mile+3

Sep 25

Red Feather Trail Jamboree

Fri, September 25, 2026

Red Feather Lakes, CO

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50k Bike+3

Sep 26

Estes Epic

Sat, September 26, 2026

Estes Park, CO

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10K+3

Sep 29

50K - Individual Age group/open

Tue, September 29, 2026

Sterling, CO

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10K+3

Sep 29

2026 Center of the Nation Series - Day 2 (CO)

Tue, September 29, 2026

Sterling, CO

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10K+3

Sep 29

10K - Individual Age group/open

Tue, September 29, 2026

Sterling, CO

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Marathon+3

Sep 29

Marathon - Individual Age group/open

Tue, September 29, 2026

Sterling, CO

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Marathon+18

Oct 3

Colorado Springs Marathon, Half, 5K, and Kids K

Sat, October 3, 2026

Colorado Springs, CO

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Kids Dash+6

Oct 3

Spooky Sprint - Denver

Sat, October 3, 2026

Denver, CO

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5K Road Run+6

Oct 3

Rim to Rim Royal Gorge Races: 5K Road Run, Trail 8 Mile, Trail Half Marathon

Sat, October 3, 2026

Canon City, 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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The Long View Marathon+2

Oct 10

The Long View Marathon

Sat, October 10, 2026

Fort Collins, CO

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Marathon+4

Oct 10

Breckenridge RunFest

Sat, October 10, 2026

Breckenridge, CO

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Half Marathon+1

Oct 11

Westy Half & 5k

Sun, October 11, 2026

Westminster, CO

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Durango Marathon+2

Oct 11

Durango Marathon

Sun, October 11, 2026

Durango, 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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