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Blue Sky Marathon

Fort Collins, CO, USA

Clear conditions throughout the day.

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Details
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Pre-Race
Race
Post-Race
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Race Overview

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.
Wikipedia

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 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.

Blue Sky Marathon Course Map

Loading Course Map...

Blue Sky Marathon Weather History

Blue Sky Marathon Weather Averages

Average Temp: 52°, Average Low: 39°, Average High: 66°
Time7AM8AM9AM10AM11AM12PM1PM2PM3PM4PM
Temp
41°
42°
48°
53°
57°
60°
62°
63°
64°
65°
Feel38°40°46°51°56°59°61°62°63°64°
Rain----------
Wind5mph
4mph
6mph
6mph
7mph
9mph
8mph
9mph
9mph
9mph
Dew30°32°32°32°32°31°31°31°31°31°
RunScoreRun Score: 7Run Score: 7Run Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 8

Blue Sky Marathon 2025

Oct 19, 2025
Clear conditions throughout the day.
Low: 30°, High: 74°
Time7AM8AM9AM10AM11AM12PM1PM2PM3PM4PM
Temp
clear-night 30°
clear-day 32°
clear-day 39°
clear-day 45°
clear-day 51°
clear-day 60°
clear-day 61°
clear-day 63°
clear-day 63°
clear-day 70°
Feel26°28°39°44°51°60°61°63°63°70°
Rain----------
Wind4mph
5mph
0mph
3mph
0mph
5mph
0mph
0mph
1mph
5mph
Dew26°28°29°29°30°31°33°37°39°38°
RunScoreRun Score: 6Run Score: 7Run Score: 7Run Score: 8Run Score: 8Run Score: 9Run Score: 8Run Score: 8Run Score: 8Run Score: 8

Blue Sky Marathon 2024

Oct 19, 2024
Partly cloudy throughout the day.
Low: 43°, High: 60°
Time7AM8AM9AM10AM11AM12PM1PM2PM3PM4PM
Temp
cloudy 43°
cloudy 43°
cloudy 44°
cloudy 45°
cloudy 48°
cloudy 51°
partly-cloudy-day 54°
partly-cloudy-day 57°
clear-day 56°
clear-day 60°
Feel39°38°41°45°47°51°54°57°56°60°
Rain----------
Wind6mph
9mph
7mph
3mph
3mph
3mph
3mph
4mph
6mph
7mph
Dew38°38°38°39°39°40°40°40°40°41°
RunScoreRun Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 9Run Score: 9Run Score: 9Run Score: 9Run Score: 9Run Score: 9

Blue Sky Marathon 2023

Oct 21, 2023
Clear conditions throughout the day.
Low: 43°, High: 79°
Time7AM8AM9AM10AM11AM12PM1PM2PM3PM4PM
Temp
clear-night 45°
clear-day 44°
clear-day 53°
clear-day 59°
clear-day 67°
clear-day 71°
clear-day 74°
clear-day 77°
clear-day 79°
clear-day 79°
Feel43°44°53°59°67°71°74°77°79°79°
Rain----------
Wind4mph
0mph
3mph
0mph
7mph
6mph
5mph
9mph
5mph
6mph
Dew27°29°28°28°29°30°29°29°27°24°
RunScoreRun Score: 8Run Score: 8Run Score: 9Run Score: 8Run Score: 9Run Score: 9Run Score: 8Run Score: 8Run Score: 8Run Score: 8

Blue Sky Marathon 2022

Oct 15, 2022
Partly cloudy throughout the day.
Low: 42°, High: 65°
Time7AM8AM9AM10AM11AM12PM1PM2PM3PM4PM
Temp
clear-night 43°
clear-day 46°
clear-day 54°
clear-day 56°
clear-day 61°
clear-day 62°
clear-day 61°
clear-day 62°
clear-day 64°
clear-day 65°
Feel41°46°54°56°61°62°61°62°64°65°
Rain----------
Wind5mph
1mph
6mph
0mph
6mph
7mph
3mph
4mph
6mph
1mph
Dew25°26°30°32°34°34°33°33°33°33°
RunScoreRun Score: 8Run Score: 8Run Score: 9Run Score: 8Run Score: 9Run Score: 9Run Score: 9Run Score: 9Run Score: 9Run Score: 8

Blue Sky Marathon 2021

Oct 16, 2021
Clear conditions throughout the day.
Low: 28°, High: 70°
Time7AM8AM9AM10AM11AM12PM1PM2PM3PM4PM
Temp
clear-night 28°
clear-day 33°
clear-day 40°
clear-day 46°
clear-day 53°
clear-day 60°
clear-day 63°
clear-day 66°
clear-day 69°
clear-day 70°
Feel28°33°40°46°53°60°63°66°69°70°
Rain----------
Wind0mph
1mph
0mph
3mph
4mph
5mph
0mph
4mph
5mph
4mph
Dew21°22°24°25°25°22°23°22°22°23°
RunScoreRun Score: 6Run Score: 6Run Score: 7Run Score: 8Run Score: 9Run Score: 9Run Score: 8Run Score: 9Run Score: 9Run Score: 9

Blue Sky Marathon 2020

Nov 14, 2020
Clear conditions throughout the day.
Low: 30°, High: 49°
Time6AM7AM8AM9AM10AM11AM12PM1PM2PM3PM
Temp
clear-night 44°
clear-day 43°
partly-cloudy-day 39°
partly-cloudy-day 43°
clear-day 44°
clear-day 43°
wind 43°
clear-day 41°
wind 39°
wind 37°
Feel39°41°29°33°35°35°31°31°27°24°
Rain----------
Wind9mph
4mph
20mph
25mph
24mph
21mph
36mph
28mph
36mph
37mph
Dew25°25°31°19°15°14°7°10°9°12°
RunScoreRun Score: 8Run Score: 8Run Score: 4Run Score: 5Run Score: 5Run Score: 5Run Score: 10Run Score: 6Run Score: 10Run Score: 10

Blue Sky Marathon 2019

Oct 19, 2019
Clear conditions throughout the day.
Low: 31°, High: 65°
Time7AM8AM9AM10AM11AM12PM1PM2PM3PM4PM
Temp
clear-night 35°
clear-day 37°
clear-day 44°
clear-day 48°
clear-day 54°
clear-day 59°
clear-day 62°
clear-day 62°
clear-day 64°
clear-day 64°
Feel32°33°44°48°54°59°62°62°64°64°
Rain----------
Wind3mph
5mph
3mph
1mph
8mph
12mph
16mph
11mph
18mph
7mph
Dew22°23°23°23°24°18°17°17°17°17°
RunScoreRun Score: 7Run Score: 8Run Score: 8Run Score: 8Run Score: 9Run Score: 8Run Score: 7Run Score: 8Run Score: 7Run Score: 9

Blue Sky Marathon 2018

Oct 20, 2018
Clear conditions throughout the day.
Low: 37°, High: 70°
Time7AM8AM9AM10AM11AM12PM1PM2PM3PM4PM
Temp
clear-night 37°
clear-day 39°
clear-day 45°
clear-day 53°
clear-day 60°
clear-day 63°
clear-day 66°
clear-day 68°
clear-day 69°
clear-day 70°
Feel35°39°45°53°60°63°66°68°69°70°
Rain----------
Wind3mph
0mph
0mph
0mph
4mph
5mph
9mph
9mph
12mph
9mph
Dew28°30°34°29°29°29°28°28°26°27°
RunScoreRun Score: 7Run Score: 7Run Score: 7Run Score: 8Run Score: 9Run Score: 9Run Score: 9Run Score: 8Run Score: 8Run Score: 8

Blue Sky Marathon 2017

Oct 21, 2017
Clear conditions throughout the day.
Low: 35°, High: 55°
Time7AM8AM9AM10AM11AM12PM1PM2PM3PM4PM
Temp
clear-night 45°
clear-day 43°
wind 45°
clear-day 47°
clear-day 50°
clear-day 51°
clear-day 52°
clear-day 53°
clear-day 52°
clear-day 52°
Feel37°35°36°39°50°51°52°53°52°52°
Rain----------
Wind20mph
20mph
30mph
25mph
24mph
23mph
21mph
22mph
27mph
23mph
Dew13°13°15°15°15°13°13°14°12°13°
RunScoreRun Score: 6Run Score: 5Run Score: 8Run Score: 6Run Score: 6Run Score: 6Run Score: 7Run Score: 6Run Score: 7Run Score: 7

Blue Sky Marathon 2016

Oct 2, 2016
Clear conditions throughout the day with late afternoon rain.
Low: 51°, High: 81°, Light Rain
Time7AM8AM9AM10AM11AM12PM1PM2PM3PM4PM
Temp
clear-day 51°
clear-day 55°
clear-day 62°
clear-day 68°
clear-day 73°
clear-day 76°
clear-day 80°
clear-day 80°
clear-day 81°
clear-day 80°
Feel51°55°62°68°73°76°80°79°79°79°
Rain----------
Wind0mph
0mph
3mph
6mph
6mph
7mph
10mph
10mph
9mph
9mph
Dew43°47°44°44°44°43°41°39°38°38°
RunScoreRun Score: 8Run Score: 8Run Score: 9Run Score: 9Run Score: 8Run Score: 8Run Score: 7Run Score: 7Run Score: 7Run Score: 8

Blue Sky Marathon 2015

Oct 4, 2015
Partly cloudy throughout the day.
Low: 48°, High: 54°
Time7AM8AM9AM10AM11AM12PM1PM2PM3PM4PM
Temp
cloudy 48°
cloudy 48°
cloudy 48°
cloudy 49°
cloudy 49°
cloudy 51°
cloudy 51°
cloudy 52°
partly-cloudy-day 53°
cloudy 54°
Feel46°47°47°46°48°51°51°52°53°54°
Rain----------
Wind6mph
4mph
5mph
6mph
4mph
5mph
1mph
4mph
5mph
7mph
Dew45°47°47°47°47°47°47°47°47°48°
RunScoreRun Score: 9Run Score: 9Run Score: 9Run Score: 9Run Score: 9Run Score: 9Run Score: 8Run Score: 9Run Score: 9Run Score: 9

Blue Sky Marathon 2014

Oct 5, 2014
Clear conditions throughout the day.
Low: 46°, High: 75°
Time7AM8AM9AM10AM11AM12PM1PM2PM3PM4PM
Temp
clear-night 46°
clear-day 47°
clear-day 56°
clear-day 63°
clear-day 67°
clear-day 70°
clear-day 72°
clear-day 72°
clear-day 74°
clear-day 75°
Feel44°47°56°63°67°70°72°72°74°75°
Rain----------
Wind4mph
0mph
3mph
3mph
0mph
6mph
10mph
8mph
7mph
21mph
Dew36°38°38°36°37°39°37°37°37°30°
RunScoreRun Score: 8Run Score: 7Run Score: 9Run Score: 9Run Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 6

Blue Sky Marathon 2013

Oct 6, 2013
Clear conditions throughout the day.
Low: 33°, High: 67°
Time7AM8AM9AM10AM11AM12PM1PM2PM3PM4PM
Temp
clear-night 38°
clear-day 39°
clear-day 46°
clear-day 53°
clear-day 56°
clear-day 60°
clear-day 63°
clear-day 66°
clear-day 67°
clear-day 67°
Feel34°39°46°53°56°60°63°66°67°67°
Rain----------
Wind5mph
0mph
1mph
6mph
10mph
7mph
5mph
6mph
5mph
3mph
Dew23°29°29°26°30°31°33°35°34°35°
RunScoreRun Score: 8Run Score: 7Run Score: 8Run Score: 9Run Score: 8Run Score: 9Run Score: 9Run Score: 9Run Score: 9Run Score: 8

Blue Sky Marathon 2012

Oct 7, 2012
Clear conditions throughout the day.
Low: 24°, High: 56°
Time7AM8AM9AM10AM11AM12PM1PM2PM3PM4PM
Temp
partly-cloudy-night 24°
partly-cloudy-day 27°
clear-day 33°
clear-day 41°
clear-day 44°
clear-day 46°
clear-day 49°
clear-day 52°
clear-day 54°
clear-day 56°
Feel24°27°33°41°44°46°49°52°54°56°
Rain----------
Wind0mph
2mph
2mph
1mph
2mph
2mph
3mph
6mph
5mph
6mph
Dew21°25°28°20°17°19°18°17°16°18°
RunScoreRun Score: 5Run Score: 6Run Score: 7Run Score: 8Run Score: 8Run Score: 8Run Score: 9Run Score: 9Run Score: 9Run Score: 9

Blue Sky Marathon 2011

Oct 2, 2011
Clear conditions throughout the day.
Low: 50°, High: 84°
Time7AM8AM9AM10AM11AM12PM1PM2PM3PM4PM
Temp
clear-day 50°
clear-day 54°
clear-day 66°
clear-day 70°
clear-day 76°
clear-day 80°
clear-day 83°
clear-day 83°
clear-day 84°
clear-day 82°
Feel48°54°66°70°76°80°80°80°82°80°
Rain----------
Wind4mph
0mph
4mph
0mph
5mph
6mph
4mph
5mph
7mph
7mph
Dew40°43°39°40°42°40°40°39°38°37°
RunScoreRun Score: 9Run Score: 8Run Score: 9Run Score: 7Run Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 8

Blue Sky Marathon 2010

Oct 3, 2010
Clear conditions throughout the day.
Low: 41°, High: 77°
Time7AM8AM9AM10AM11AM12PM1PM2PM3PM4PM
Temp
clear-day 41°
clear-day 43°
clear-day 48°
clear-day 54°
clear-day 60°
clear-day 67°
clear-day 71°
clear-day 74°
clear-day 76°
clear-day 77°
Feel41°42°48°54°60°67°71°74°76°77°
Rain----------
Wind0mph
3mph
2mph
2mph
4mph
4mph
7mph
6mph
3mph
5mph
Dew38°39°40°43°43°43°43°42°43°43°
RunScoreRun Score: 7Run Score: 8Run Score: 8Run Score: 8Run Score: 9Run Score: 9Run Score: 8Run Score: 8Run Score: 8Run Score: 8

Blue Sky Marathon 2009

Oct 4, 2009
Partly cloudy throughout the day with rain.
Low: 37°, High: 46°, Light Rain
Time7AM8AM9AM10AM11AM12PM1PM2PM3PM4PM
Temp
partly-cloudy-day 39°
cloudy 42°
cloudy 44°
cloudy 46°
cloudy 44°
cloudy 43°
rain 43°
cloudy 43°
cloudy 45°
cloudy 44°
Feel34°38°41°41°38°36°37°37°40°39°
Rain------light---
Wind7mph
8mph
6mph
11mph
14mph
12mph
10mph
11mph
8mph
10mph
Dew32°34°35°36°36°39°41°41°41°41°
RunScoreRun Score: 7Run Score: 8Run Score: 8Run Score: 7Run Score: 6Run Score: 7Run Score: 7Run Score: 7Run Score: 8Run Score: 7

Blue Sky Marathon 2008

Oct 5, 2008
Partly cloudy throughout the day with rain.
Low: 46°, High: 69°, Light Rain
Time7AM8AM9AM10AM11AM12PM1PM2PM3PM4PM
Temp
partly-cloudy-night 48°
cloudy 52°
partly-cloudy-day 55°
clear-day 60°
clear-day 64°
clear-day 66°
clear-day 68°
clear-day 69°
clear-day 66°
cloudy 66°
Feel45°52°55°60°64°66°68°69°66°66°
Rain----------
Wind6mph
4mph
8mph
9mph
9mph
5mph
8mph
9mph
5mph
8mph
Dew43°44°45°45°43°43°38°39°38°37°
RunScoreRun Score: 9Run Score: 9Run Score: 9Run Score: 8Run Score: 9Run Score: 9Run Score: 8Run Score: 8Run Score: 9Run Score: 9