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Colorado Marathons

Colorado has 20 active marathons this year. Races are most common in October, June, and August. Course terrain for these courses is most often hilly or very hilly. Typical race day temperatures range from 32°F to 72°F.

Popular races include the Colfax Marathon, Boulderthon - Boulder Marathon, and Colorado Marathon. 9 certified courses can be great Boston qualifier options. Races with the best Boston qualifying percentages include the Aspen Valley Marathon — 10.4% BQ and Colorado Marathon — 8.9% BQ.

Browse by metro or city:

Colorado Marathons	Course	PR Score	Finishers	BQ%	Reviews	Compare
Run Through Time Marathon Salida, CO 03/14/2026	Very Hilly 182 Finishers	PR Score Course is Not Certified	182 Finishers	Course is Not Certified	Reviews	Compare Races
Run with Scissors Marathon Brighton, CO 04/25/2026	Rolling Hills 18 Finishers	PR Score Course is Not Certified	18 Finishers	Course is Not Certified	Reviews	Compare Races
Colorado Marathon Fort Collins, CO 05/03/2026	Downhill 1,081 Finishers	PR Score	1,081 Finishers		Reviews	Compare Races
Colfax Marathon Denver, CO 05/17/2026	Rolling Hills 2,276 Finishers	PR Score	2,276 Finishers		Reviews	Compare Races
Steamboat Marathon Steamboat Springs, CO 06/07/2026	Downhill 302 Finishers	PR Score	302 Finishers		Reviews	Compare Races
Estes Park Marathon Estes Park, CO 06/21/2026	Downhill 144 Finishers	PR Score Course is Not Certified	144 Finishers	Course is Not Certified	Reviews	Compare Races
Leadville Trail Marathon Leadville, CO 06/27/2026	Very Hilly 709 Finishers	PR Score Course is Not Certified	709 Finishers	Course is Not Certified	Reviews	Compare Races
Aspen Valley Marathon Basalt, CO 07/25/2026	Downhill 222 Finishers	PR Score	222 Finishers		Reviews	Compare Races
Bound for Boston (Denver) Marathon Denver, CO 08/02/2026	Mostly Flat 8 Finishers	PR Score	8 Finishers		Reviews	Compare Races
Boulder Rez Marathon Boulder, CO 08/15/2026	Rolling Hills 94 Finishers	PR Score	94 Finishers		Reviews	Compare Races
Staunton Rocks! Marathon Pine, CO 08/22/2026	Very Hilly 93 Finishers	PR Score Course is Not Certified	93 Finishers	Course is Not Certified	Reviews	Compare Races
Fall Equinox Marathon Fort Collins, CO 09/20/2026	Hilly 95 Finishers	PR Score	95 Finishers		Reviews	Compare Races
Pikes Peak Marathon Manitou Springs, CO 09/20/2026	Very Hilly 722 Finishers	PR Score Course is Not Certified	722 Finishers	Course is Not Certified	Reviews	Compare Races
Boulderthon - Boulder Marathon Boulder, CO 09/27/2026	Hilly 1,998 Finishers	PR Score	1,998 Finishers		Reviews	Compare Races
Colorado Springs Marathon Colorado Springs, CO 10/03/2026	Hilly 431 Finishers	PR Score Course is Not Certified	431 Finishers	Course is Not Certified	Reviews	Compare Races
Windsor Marathon Windsor, CO 10/04/2026	Hilly 53 Finishers	PR Score Course is Not Certified	53 Finishers	Course is Not Certified	Reviews	Compare Races
Breckenridge Road Marathon Breckenridge, CO 10/10/2026	Hilly 78 Finishers	PR Score Course is Not Certified	78 Finishers	Course is Not Certified	Reviews	Compare Races
Long View Marathon Loveland, CO 10/10/2026	Rolling Hills 157 Finishers	PR Score	157 Finishers		Reviews	Compare Races
Blue Sky Marathon Fort Collins, CO 10/18/2026	Hilly 143 Finishers	PR Score Course is Not Certified	143 Finishers	Course is Not Certified	Reviews	Compare Races
Rim Rock Marathon Fruita, CO 11/01/2026	Very Hilly 101 Finishers	PR Score Course is Not Certified	101 Finishers	Course is Not Certified	Reviews	Compare Races

VOTE FOR YOUR FAVORITE MARATHONS

VOTE FOR YOUR FAVORITE MARATHONS

Best Boston Marathon Qualifiers

It's here! Our annual list of the year'sbest marathons to help you qualify for the Boston Marathon.

2026 IS HERE!

Marathon Pace Bands

Run the Right Pace in Your Next Marathon

Nearly 500 marathon courses.Ships same or Next Day

Colorado Marathons

Run Through Time Marathon

Salida, CO 03/14/2026

Very Hilly

182 Finishers

--- PR Score

Course isNot Certified

182 Finishers

Course isNot Certified

Reviews

Compare Races

Run with Scissors Marathon

Brighton, CO 04/25/2026

Rolling Hills

18 Finishers

--- PR Score

Course isNot Certified

18 Finishers

Course isNot Certified

Reviews

Compare Races