Colfax Marathon

Denver, CO, USA · May 17, 2026

56°·65° high·Breezy·Dry

Weather

Race Day Weather

56°at start

65° high

Breezy

Dry

Wet conditions, adjust expectations

Runners will face a starting temperature of 54°F, rising to 65°F, with a consistent light rain expected throughout. Winds will be from the E at 10 mph, creating a mild headwind effect. With the potential for slippery surfaces, runners should adjust their pace and prioritize safety over speed.

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Pace Calculator

Distance: 26.2mi

Target Finish Time

0:00:00

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Race Info

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

Website

Course Map

FAQ

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 Qualifier?

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

What will the weather be like for the 2026 Colfax Marathon?

The forecast calls for a high of 65°F and a low of 52°F with a 77% chance of rain. Check our detailed hourly forecast above for the best marathon race plan.

Historical Weather

Based on 19 years of data

Avg Temp

67°F

L:46° H:67°

RunScore

Conditions

Rain Freq

11%

2 of 19 yrs

Wind8mph

Dew33°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2025 Colfax Marathon Partly cloudy throughout the day with rain. 2025	46°/64°	Light	43°
2024 Colfax Marathon Partly cloudy throughout the day. 2024	55°/78°	-	38°
2023 Colfax Marathon Partly cloudy throughout the day. 2023	51°/71°	-	41°
2022 Colfax Marathon Partly cloudy throughout the day. 2022	55°/72°	-	35°
2021 Colfax Marathon Clear conditions throughout the day. 2021	35°/69°	-	17°
2019 Colfax Marathon Partly cloudy throughout the day with rain. 2019	37°/58°	-	37°
2018 Colfax Marathon Cloudy skies throughout the day. 2018	42°/55°	-	42°
2017 Colfax Marathon Becoming cloudy in the afternoon with late afternoon rain. 2017	45°/63°	-	32°
2016 Colfax Marathon Partly cloudy throughout the day. 2016	41°/58°	-	37°
2015 Colfax Marathon Partly cloudy throughout the day. 2015	46°/63°	-	33°
2014 Colfax Marathon Partly cloudy throughout the day. 2014	50°/80°	-	37°
2013 Colfax Marathon Partly cloudy throughout the day with late afternoon rain. 2013	51°/66°	-	31°
2012 Colfax Marathon Partly cloudy throughout the day. 2012	47°/72°	-	39°
2011 Colfax Marathon Cloudy skies throughout the day with rain or snow clearing later. 2011	34°/44°	Light	33°
2010 Colfax Marathon Partly cloudy throughout the day. 2010	41°/62°	-	38°
2009 Colfax Marathon Partly cloudy throughout the day. 2009	50°/76°	-	31°
2008 Colfax Marathon Partly cloudy throughout the day. 2008	53°/81°	-	32°
2007 Colfax Marathon Partly cloudy throughout the day. 2007	55°/75°	-	42°
2006 Colfax Marathon Partly cloudy throughout the day. 2006	36°/63°	-	23°

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