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Colorado

Here's a full listing of races and events in Colorado.

Visit these pages for just marathons, half marathon, 10K or 5K races.

featured races

Currently there are no featured events for this state.

running & multisport races

Sharin' O' The Green 5k

May 14, 2026

Endure Trail Runs

May 16, 2026

BOLDERBoulder 2026

May 25, 2026

Weld Your Mettle Running Festival

May 30, 2026

Ragnar Trail Colorado

Jun 5, 2026

Snowmass Village

Summits Trail Runs

Jun 6, 2026

Jun 7, 2026

San Juan Trail Tri

Triathlon / Multisport

Jun 13, 2026

Garden 10 Races

Jun 14, 2026

Colorado Springs

Mesa Verde Virtual 5K

Jun 14, 2026

Unicorn 5k (Denver - North)

Jun 20, 2026

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

Jun 20, 2026

Father's Day Classic

Jun 21, 2026

Timberview Trail Run

Jun 27, 2026

Let Freedom Run - LONGMONT

Jul 4, 2026

Let Freedom Run - Louisville

Jul 4, 2026

Telluride Foundation Rundola

Jul 4, 2026

Jul 4, 2026

Silverheels Trail Runs

Jul 10, 2026

Silver Rush 50 Run

Jul 11, 2026

High Lonesome 100

Jul 17, 2026

Silverton Alpine Runs

Jul 18, 2026

Summer Splash Prairie Dog Half Marathon, 10k & 5k

Jul 18, 2026

Aspen Valley Marathon

Jul 18, 2026

Kendall Mountain Run

Jul 19, 2026

Never Summer 100km & 60km

Jul 24, 2026

Box Canyon Trail Races

Jul 25, 2026

Pikes Peak Ultra

Jul 25, 2026

Colorado Springs

Rocky Mountain Half & 5K

Aug 1, 2026

Sheep Mountain Trail Runs

Aug 1, 2026

Unicorn 5k (South)

Aug 1, 2026

Highlands Ranch

Leadville Trail 10K

Aug 16, 2026

Aug 16, 2026

Leadville Trail 100 RUN

Aug 22, 2026

Telluride Mountain Run

Aug 22, 2026

Aug 23, 2026

Pioneer Prairie Dog Half Marathon, 10K & 5K

Aug 23, 2026

Rock Hawk Trail Races

Aug 29, 2026

Wine Run 5k at The Winery at Holy Cross Abbey

Aug 30, 2026

Cirque Series Arapahoe Basin

Sep 5, 2026

2026 Lake Nighthorse Triathlon - Sprint and Olympic

Triathlon / Multisport

Sep 12, 2026

Sep 12, 2026

Sep 18, 2026

Steamboat Springs

Pikes Peak Marathon + Ascent

Sep 19, 2026

Colorado Springs

Triathlon / Multisport

Sep 19, 2026

Fall Equinox Marathon, Half Marathon & 5 Mile

Sep 20, 2026

2026 Night Nation Run - Denver, CO

Sep 26, 2026

West Line Winder

Sep 26, 2026

Sangre de Cristo Trail Festival

Sep 26, 2026

OUTLAST COLORADO SPRINGS

Sep 26, 2026

Colorado Springs