The 2025 event has concluded.

Colfax Marathon

Denver, CO, USA • May 18, 2025
TopDescriptionCourseCommunity
Register

Subscribe

Get updates on the Colfax Marathon race forecast and be the first to know if the forecast shifts.

Text Updates

Maximum one update per day. Standard messaging rates apply. Currently only supports USA, UK, and Canada.

Phone Number

Email Updates

By submitting your email you agree to receive weather forecasts and racecast.io updates.

rain Partly cloudy throughout the day with rain.

OOahhh ooof ooos yahhh - The most comfortable recovery slide you'll ever wear. OOFOS OOahh Slide.When you buy through our links, we may earn a commission.

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

Area Map

Course Maps

FAQ

Ask a Question about the Colfax Marathon

Racecast Concierge (free during beta)

Ask a question about the Colfax Marathon and we'll do the hard part and find the answer for you within 48 hours.

By using Racecast Concierge, you agree to receive email alerts pertaining to the Colfax Marathon and general racecast.io updates.

When is the 2025 Colfax Marathon?

The 2025 Colfax Marathon will be held on Sunday May 18, 2025.

Is the Colfax Marathon a Boston Marathon Qualfier?

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

Community

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

Click here to view this item from .

11d
bvd's Avatar
bvd
News

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

23d
bvd's Avatar
bvd
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.

13d
bvd's Avatar
bvd
News

Historical Weather & Results

RunScore
Run Score: 8
Temp
67°F
Min/Max
46°/67°F
Dew
32°F
Days of Rain
1/18
Wind
8mph
Tap a row for details.
YearLow / HighRain

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