The 2026 Casper Marathon has concluded.

Casper Marathon

Race complete

Casper, WY, USA · June 7, 2026

51°·87° high·Windy·Dry

Race Day Weather

51°at start

89° high

Gusty

Dry

Warm afternoon, headwind challenges

Runners will face a starting temperature of 51°F, rising to a warm 87°F by the finish. Winds out of the SW at 22 mph will create a challenging headwind throughout the race. With humidity at a comfortable 36%, pacing should be conservative in the early miles to prepare for the heat later on.

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Distance: 26.2mi

Target Finish Time

0:00:00

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Race Info

The Casper Marathon is an annual road race held in Casper, Wyoming, first run in 2003. The course starts at the WYO Sports Ranch and finishes at Crossroads Park, following the Platte River Trails system through downtown Casper. The marathon is certified as a Boston Marathon qualifier and is sanctioned by USA Track and Field. The event also includes a half marathon, 10K, and relay divisions. Source

Website

Course Map

FAQ

When is the 2026 Casper Marathon?

The 2026 Casper Marathon will be held on Sunday June 7, 2026.

Is the Casper Marathon a Boston Marathon Qualifier?

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

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

The forecast calls for a high of 89°F and a low of 51°F with a 0% chance of rain.

Historical Weather

Based on 23 years of data

Avg Temp

74°F

L:47° H:75°

RunScore

Conditions

Rain Freq

17%

4 of 23 yrs

Wind12mph

Dew40°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2026 Casper Marathon Clear conditions throughout the day. 2026	51°/88°	-	39°
2025 Casper Marathon Clear conditions throughout the day with late afternoon rain. 2025	47°/88°	-	46°
2024 Casper Marathon Becoming cloudy in the afternoon with afternoon rain. 2024	56°/73°	-	40°
2023 Casper Marathon Partly cloudy throughout the day with afternoon rain. 2023	52°/63°	Light	54°
2022 Casper Marathon Becoming cloudy in the afternoon. 2022	51°/70°	-	46°
2021 Casper Marathon Clear conditions throughout the day. 2021	57°/76°	-	46°
2019 Casper Marathon Clear conditions throughout the day. 2019	44°/75°	-	49°
2018 Casper Marathon Clear conditions throughout the day. 2018	39°/75°	-	39°
2017 Casper Marathon Clear conditions throughout the day. 2017	46°/80°	-	44°
2016 Casper Marathon Partly cloudy throughout the day. 2016	48°/81°	-	43°
2015 Casper Marathon Partly cloudy throughout the day with rain clearing later. 2015	53°/70°	Light	50°
2014 Casper Marathon Partly cloudy throughout the day with rain. 2014	44°/65°	Light	45°
2013 Casper Marathon Clear conditions throughout the day. 2013	36°/78°	-	35°
2012 Casper Marathon Clear conditions throughout the day with afternoon rain. 2012	53°/79°	-	44°
2011 Casper Marathon Clear conditions throughout the day. 2011	45°/83°	-	40°
2010 Casper Marathon Clear conditions throughout the day. 2010	43°/74°	-	46°
2009 Casper Marathon Cloudy skies throughout the day with rain. 2009	41°/48°	Light	40°
2008 Casper Marathon Partly cloudy throughout the day. 2008	36°/61°	-	26°
2007 Casper Marathon Clear conditions throughout the day. 2007	40°/70°	-	46°
2006 Casper Marathon Clear conditions throughout the day. 2006	48°/83°	-	45°
2005 Casper Marathon Clear conditions throughout the day. 2005	45°/72°	-	40°
2004 Casper Marathon Clear conditions throughout the day. 2004	63°/90°	-	37°
2003 Casper Marathon Partly cloudy throughout the day with late afternoon rain. 2003	50°/72°	-	49°