Blue Sky Marathon

Fort Collins, CO, USA • October 17, 2026

Race Day Weather

39°

66° high

Breezy

Dry

Chilly start, warming finish

Runners will face a temperature increase from 39°F at the start to 66°F by the finish, with a light wind peaking at 9 mph from the SE. The first half features beneficial tailwinds, while miles 8-13 will be challenging due to headwinds. Runners should plan for hydration breaks in the warmer segments and pace conservatively during the climbs, especially at miles 2-4 and 21.

Race day forecast available in 204 days

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Pace Calculator

Distance: 26.2mi

Target Finish Time

0:00:00

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Pace

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Weather Adj.

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Common Goals:

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. Source

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.

Historical Weather

Based on 18 years of data

Avg Temp

65°F

L:40° H:66°

RunScore

Conditions

Rain Freq

1 of 18 yrs

Wind10mph

Dew31°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2025 Blue Sky Marathon Clear conditions throughout the day. 2025	30°/70°	-	32°
2024 Blue Sky Marathon Partly cloudy throughout the day. 2024	43°/60°	-	39°
2023 Blue Sky Marathon Clear conditions throughout the day. 2023	44°/79°	-	28°
2022 Blue Sky Marathon Partly cloudy throughout the day. 2022	43°/65°	-	31°
2021 Blue Sky Marathon Clear conditions throughout the day. 2021	28°/70°	-	23°
2020 Blue Sky Marathon Clear conditions throughout the day. 2020	37°/44°	-	17°
2019 Blue Sky Marathon Clear conditions throughout the day. 2019	35°/64°	-	20°
2018 Blue Sky Marathon Clear conditions throughout the day. 2018	37°/70°	-	29°
2017 Blue Sky Marathon Clear conditions throughout the day. 2017	43°/53°	-	14°
2016 Blue Sky Marathon Clear conditions throughout the day with late afternoon rain. 2016	51°/81°	-	42°
2015 Blue Sky Marathon Partly cloudy throughout the day. 2015	48°/54°	-	47°
2014 Blue Sky Marathon Clear conditions throughout the day. 2014	46°/75°	-	36°
2013 Blue Sky Marathon Clear conditions throughout the day. 2013	38°/67°	-	31°
2012 Blue Sky Marathon Clear conditions throughout the day. 2012	24°/56°	-	20°
2011 Blue Sky Marathon Clear conditions throughout the day. 2011	50°/84°	-	40°
2010 Blue Sky Marathon Clear conditions throughout the day. 2010	41°/77°	-	42°
2009 Blue Sky Marathon Partly cloudy throughout the day with rain. 2009	39°/46°	Light	37°
2008 Blue Sky Marathon Partly cloudy throughout the day with rain. 2008	48°/69°	-	41°