Blue Sky Marathon

Fort Collins, CO, USA · October 17, 2026
clear-day41°·66° high·Breezy·Dry
8
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Race Day Weather

clear-day
41°at start
66° high
Breezy
Dry

Cool start, warming finish

Runners will face a temperature rise from 39°F at the start to 66°F by the finish, with a tailwind throughout most of the race. The wind will shift to a headwind between miles 5-13, making the hilly sections particularly challenging. Hydration should be prioritized as temperatures climb, and runners are advised to adjust their pacing strategy during the climbs at miles 2-4 and 21 to ensure energy is conserved for the final descent.

Race day forecast available in 166 days
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Pace Calculator

Distance: 26.2mi
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Race Info

The Blue Sky Marathon in Fort Collins, Colorado, offers runners a challenging 26.2-mile course through the picturesque Front Range mountains. Starting at the Blue Sky Trailhead in Horsetooth Mountain Park, the route features approximately 3,500 feet of elevation gain and loss, traversing a variety of terrains including smooth dirt trails, technical rock gardens, and distinctive redstone hardpack. With generous time allowances and a supportive community, this race caters to both seasoned trail runners and those new to the sport.

FAQ

When is the 2026 Blue Sky Marathon?

The 2026 Blue Sky Marathon will be held on Saturday October 17, 2026.

Is the Blue Sky Marathon a Boston Marathon Qualifier?

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.

What will the weather be like for the 2026 Blue Sky Marathon?

The forecast calls for a high of 66°F and a low of 39°F with a 0% chance of rain.

Historical Weather

Based on 18 years of data
Avg Temp
65°F
L:40° H:66°
RunScore
8
Conditions
Rain Freq
6%
1 of 18 yrs
Wind10mph
Dew31°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScore
2025
clear-night
30°/70°-
8
2024
cloudy
43°/60°-
9
2023
clear-night
44°/79°-
8
2022
clear-night
43°/65°-
8
2021
clear-night
28°/70°-
8
2020
clear-night
37°/44°-
7
2019
clear-night
35°/64°-
8
2018
clear-night
37°/70°-
8
2017
clear-night
43°/53°-
6
2016
clear-day
51°/81°-
8
2015
cloudy
48°/54°-
9
2014
clear-night
46°/75°-
8
2013
clear-night
38°/67°-
8
2012
partly-cloudy-night
24°/56°-
8
2011
clear-day
50°/84°-
8
2010
clear-day
41°/77°-
8
2009
partly-cloudy-day
39°/46°Light
7
2008
partly-cloudy-night
48°/69°-
9