Colfax Marathon

Denver, CO, USA • May 17, 2026
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partly-cloudy-day Partly cloudy throughout the day.

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The Colfax Marathon (previously known as the Colorado Colfax Marathon) is an annual marathon foot-race held in Colorado, United States, since 2006. Significant portions of the course follow Colfax Avenue. Wikipedia

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When is the 2026 Colfax Marathon?

The 2026 Colfax Marathon will be held on Sunday May 17, 2026.

Is the Colfax Marathon a Boston Marathon Qualfier?

Yes, the Colfax Marathon is an official Boston Marathon qualifier.

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News

The 18th Denver Colfax Marathon, presented by Cigna Healthcare, is making some exciting changes to its 2024 race courses.

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News

Denver Colfax Marathon May 2024 races include marathon, half marathon, 10 miler, 5K and nation’s largest marathon relay. Registration early prices increase Colorado.

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Historical Weather & Results

RunScore
Run Score: 8
Temp
67°F
Min/Max
46°/67°F
Dew
33°F
Days of Rain
2/19
Wind
8mph
Tap a row for details.
YearLow / HighRain

Colfax Marathon 2025 Weather History

Partly cloudy throughout the day with rain.

2025
partly-cloudy-day
46°/ 64°Light
Run Score: 8

Colfax Marathon 2024 Weather History

Partly cloudy throughout the day.

2024
partly-cloudy-day
55°/ 78°-
Run Score: 8

Colfax Marathon 2023 Weather History

Partly cloudy throughout the day.

2023
partly-cloudy-day
51°/ 71°-
Run Score: 8

Colfax Marathon 2022 Weather History

Partly cloudy throughout the day.

2022
partly-cloudy-day
55°/ 72°-
Run Score: 8

Colfax Marathon 2021 Weather History

Clear conditions throughout the day.

2021
clear-night
35°/ 69°-
Run Score: 9

Colfax Marathon 2019 Weather History

Partly cloudy throughout the day with rain.

2019
cloudy
37°/ 58°-
Run Score: 8

Colfax Marathon 2018 Weather History

Cloudy skies throughout the day.

2018
cloudy
42°/ 55°-
Run Score: 8

Colfax Marathon 2017 Weather History

Becoming cloudy in the afternoon with late afternoon rain.

2017
partly-cloudy-day
45°/ 63°-
Run Score: 9

Colfax Marathon 2016 Weather History

Partly cloudy throughout the day.

2016
cloudy
41°/ 58°-
Run Score: 8

Colfax Marathon 2015 Weather History

Partly cloudy throughout the day.

2015
partly-cloudy-day
46°/ 63°-
Run Score: 8

Colfax Marathon 2014 Weather History

Partly cloudy throughout the day.

2014
partly-cloudy-day
50°/ 80°-
Run Score: 8

Colfax Marathon 2013 Weather History

Partly cloudy throughout the day with late afternoon rain.

2013
partly-cloudy-day
51°/ 66°-
Run Score: 9

Colfax Marathon 2012 Weather History

Partly cloudy throughout the day.

2012
partly-cloudy-day
47°/ 72°-
Run Score: 9

Colfax Marathon 2011 Weather History

Cloudy skies throughout the day with rain or snow clearing later.

2011
rain
34°/ 44°Light
Run Score: 7

Colfax Marathon 2010 Weather History

Partly cloudy throughout the day.

2010
partly-cloudy-day
41°/ 62°-
Run Score: 8

Colfax Marathon 2009 Weather History

Partly cloudy throughout the day.

2009
partly-cloudy-day
50°/ 76°-
Run Score: 9

Colfax Marathon 2008 Weather History

Partly cloudy throughout the day.

2008
partly-cloudy-day
53°/ 81°-
Run Score: 8

Colfax Marathon 2007 Weather History

Partly cloudy throughout the day.

2007
partly-cloudy-day
55°/ 75°-
Run Score: 8

Colfax Marathon 2006 Weather History

Partly cloudy throughout the day.

2006
clear-day
36°/ 63°-
Run Score: 8
You Need an Account For That

Setting up a racecast.io account will allow you to start building a reputation in the community. Over time you'll be able to rate races, join the discussion, and post in the community.

Right now we are invite only, you can get on the waitlist by entering your email below:

OR
You Need an Account For That

Setting up a racecast.io account will allow you to start building a reputation in the community. Over time you'll be able to rate races, join the discussion, and post in the community.

Right now we are invite only, you can get on the waitlist by entering your email below:

OR