Regional directory

Marathons in Colorado, United States 2026

30 races currently published in this region. Start here when the country page is too broad and you need a tighter race shortlist.

30 published races
11 cities to explore

Race list

Published races in Colorado

Compare races in this region, then open a city page if you need an even tighter map.

🏃 United States
Open Jan 7, 2026
United States

2026 C.O.P.S. WINTER RACE SERIES

Colorado 10K, 5K
Free Open race intelligence
🏃 United States
Open Jan 15, 2026
United States

2026 Aspen Snowmass Town Race Series presented by HEAD

Colorado Kids' Run
Free Open race intelligence
🏃 United States
Open Jan 24, 2026
United States

12 Hours of Sunlight

Colorado Full Marathon
Free Open race intelligence
🏃 United States
Open Apr 19, 2026
United States

2026 Fairmount Fit Fest

Colorado 5K, Kids' Run, Virtual
Free Open race intelligence
🏃 United States
Open Apr 26, 2026
United States

2026 Flying Pig 5K

Colorado 5K, Kids' Run
Free Open race intelligence
🏃 United States
Open Apr 28, 2026
United States

2026 Dash & Dine 5k Run Series

Colorado 5K
Free Open race intelligence
🏃 United States
Open May 2, 2026
United States

18 Hours of Fruita

Colorado Full Marathon
Free Open race intelligence
🏃 Fort Collins
Open May 3, 2026
United States

The Colorado Marathon

Fort Collins, Colorado Full Marathon, Half Marathon, 10K, 5K
BQ Certified
$120.00 from Open race intelligence
🏃 Fort Collins
Open May 3, 2026
United States

Colorado Marathon (Fort Collins to Poudre Canyon)

Fort Collins, Colorado Full Marathon, Half Marathon, 10K
BQ Certified
$90.00 from Open race intelligence
🏃 United States
Open May 3, 2026
United States

2026 Altitude Elementary Moose Mudder

Colorado 5K
Free Open race intelligence
🏃 United States
Open May 9, 2026
United States

12 Hours of Mesa Verde

Colorado Relay, Kids' Run
Free Open race intelligence
🏃 United States
Open May 9, 2026
United States

2026 Five Star 5K, Mile of Smiles, and Wellness Festival

Colorado 5K, Kids' Run
Free Open race intelligence
🏃 Denver
Open May 17, 2026
United States

Denver Colfax Marathon

Denver, Colorado Full Marathon, Half Marathon, 5K, Relay
BQ Certified
$100.00 from Open race intelligence
🏃 United States
Open May 24, 2026
United States

2026 CKF Cape Town Marathon

Colorado Full Marathon
Free Open race intelligence
🏃 Boulder
Open May 25, 2026
United States

BOLDERBoulder 10K

Boulder, Colorado 10K, Virtual
Certified
$69.00 from Open race intelligence
🏃 United States
Open May 30, 2026
United States

2026 MTHCF 5K

Colorado 5K
Free Open race intelligence
🏃 United States
Open Jun 6, 2026
United States

2.2 for 22q Walk/Run/Ride 2026

Colorado Full Marathon, Half Marathon, 5K, Kids' Run, Virtual
Free Open race intelligence
🏃 Aspen
Open Jun 14, 2026
United States

Aspen Valley Marathon

Aspen, Colorado Full Marathon, Half Marathon, 10K
Certified
$100.00 from Open race intelligence
🏃 United States
Open Jun 21, 2026
United States

14th Annual Buffs4Life Kyle MacIntosh Memorial 5K Run/Walk

Colorado 5K, Ultra Marathon
Free Open race intelligence
🏃 United States
Open Jul 23, 2026
United States

14er Challenge

Colorado Full Marathon
Free Open race intelligence
🏃 Leadville
Featured Aug 15, 2026
United States

Leadville Trail 100 Run

Leadville, Colorado Ultra Marathon, 100 miles (160km)
$350.00 from Open race intelligence
🏃 United States
Open Aug 15, 2026
United States

2026 CKF Leadville Trail 100 MTB

Colorado Ultra Marathon
Free Open race intelligence
🏃 Manitou Springs
Featured Aug 16, 2026
United States

Pikes Peak Marathon

Manitou Springs, Colorado Full Marathon, Half Marathon
$110.00 from Open race intelligence
🏃 Leadville
Open Aug 22, 2026
United States

Leadville Trail 100 Run

Leadville, Colorado Ultra Marathon
$195.00 from Open race intelligence