The 2025 event has concluded.

Blue Sky Marathon

Fort Collins, CO, USA • October 19, 2025
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clear-day Clear conditions throughout the day.

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When is the 2025 Blue Sky Marathon?

The 2025 Blue Sky Marathon will be held on Sunday October 19, 2025.

Is the Blue Sky Marathon a Boston Marathon Qualfier?

No, the Blue Sky Marathon is NOT a Boston Marathon qualifier.

What is the time limit for the Blue Sky Marathon?

The time limit for the Blue Sky Marathon is 9 hours.

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Historical Weather & Results

RunScore
Run Score: 8
Temp
65°F
Min/Max
41°/66°F
Dew
30°F
Days of Rain
1/17
Wind
10mph
Tap a row for details.
YearLow / HighRain

Blue Sky Marathon 2024 Weather History

Partly cloudy throughout the day.

2024
cloudy
43°/ 60°-
Run Score: 9

Blue Sky Marathon 2023 Weather History

Clear conditions throughout the day.

2023
clear-night
44°/ 79°-
Run Score: 8

Blue Sky Marathon 2022 Weather History

Partly cloudy throughout the day.

2022
clear-night
43°/ 65°-
Run Score: 8

Blue Sky Marathon 2021 Weather History

Clear conditions throughout the day.

2021
clear-night
28°/ 70°-
Run Score: 8

Blue Sky Marathon 2020 Weather History

Clear conditions throughout the day.

2020
clear-night
37°/ 44°-
Run Score: 7

Blue Sky Marathon 2019 Weather History

Clear conditions throughout the day.

2019
clear-night
35°/ 64°-
Run Score: 8

Blue Sky Marathon 2018 Weather History

Clear conditions throughout the day.

2018
clear-night
37°/ 70°-
Run Score: 8

Blue Sky Marathon 2017 Weather History

Clear conditions throughout the day.

2017
clear-night
43°/ 53°-
Run Score: 6

Blue Sky Marathon 2016 Weather History

Clear conditions throughout the day with late afternoon rain.

2016
clear-day
51°/ 81°-
Run Score: 8

Blue Sky Marathon 2015 Weather History

Partly cloudy throughout the day.

2015
cloudy
48°/ 54°-
Run Score: 9

Blue Sky Marathon 2014 Weather History

Clear conditions throughout the day.

2014
clear-night
46°/ 75°-
Run Score: 8

Blue Sky Marathon 2013 Weather History

Clear conditions throughout the day.

2013
clear-night
38°/ 67°-
Run Score: 8

Blue Sky Marathon 2012 Weather History

Clear conditions throughout the day.

2012
partly-cloudy-night
24°/ 56°-
Run Score: 8

Blue Sky Marathon 2011 Weather History

Clear conditions throughout the day.

2011
clear-day
50°/ 84°-
Run Score: 8

Blue Sky Marathon 2010 Weather History

Clear conditions throughout the day.

2010
clear-day
41°/ 77°-
Run Score: 8

Blue Sky Marathon 2009 Weather History

Partly cloudy throughout the day with rain.

2009
partly-cloudy-day
39°/ 46°Light
Run Score: 7

Blue Sky Marathon 2008 Weather History

Partly cloudy throughout the day with rain.

2008
partly-cloudy-night
48°/ 69°-
Run Score: 9
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