Casper Marathon

Casper, WY, USA · June 7, 2026

59°·77° high·Breezy·Dry

Weather

Course

Race Info

FAQ

History

Race Day Weather

59°at start

78° high

Breezy

Dry

Warm finish, pace wisely

Runners will face a starting temperature of 54°F, rising to a warm 78°F by the end. Winds will be from the SW at 11 mph, with gusts reaching 28 mph. Given the temperature increase, it's advisable for runners to adjust their pace and hydrate frequently, especially in the later stages.

Race day forecast available in 26 days

5 AM

6 AM

7 AM

8 AM

9 AM

10 AM

11 AM

12 PM

1 PM

2 PM

3 PM

Pre-raceRace windowPost-race

Get forecast alerts for Casper Marathon

We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.

Race Info

The Visit Casper Marathon seeks to create a unique and memorable race experience for all its participants whether they are first time runners or elite athletes. We strive for a safe, enjoyable, and yet a challenging race events that pushes racers to achieve their best within our supportive running atmosphere and the Casper Wyoming community. 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 78°F and a low of 51°F with a 0% chance of rain.

Historical Weather

Based on 22 years of data

Avg Temp

74°F

L:52° H:75°

RunScore

Conditions

Rain Freq

14%

3 of 22 yrs

Wind11mph

Dew39°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2025 Casper Marathon Clear conditions throughout the day with late afternoon rain. 2025	57°/90°	-	45°
2024 Casper Marathon Becoming cloudy in the afternoon with afternoon rain. 2024	57°/75°	-	40°
2023 Casper Marathon Partly cloudy throughout the day with afternoon rain. 2023	55°/63°	Light	55°
2022 Casper Marathon Becoming cloudy in the afternoon. 2022	53°/72°	-	45°
2021 Casper Marathon Clear conditions throughout the day. 2021	57°/77°	-	46°
2019 Casper Marathon Clear conditions throughout the day. 2019	51°/77°	-	49°
2018 Casper Marathon Clear conditions throughout the day. 2018	46°/76°	-	40°
2017 Casper Marathon Clear conditions throughout the day. 2017	55°/82°	-	43°
2016 Casper Marathon Partly cloudy throughout the day. 2016	50°/81°	-	43°
2015 Casper Marathon Partly cloudy throughout the day with rain clearing later. 2015	54°/71°	-	49°
2014 Casper Marathon Partly cloudy throughout the day with rain. 2014	49°/65°	Light	46°
2013 Casper Marathon Clear conditions throughout the day. 2013	46°/79°	-	34°
2012 Casper Marathon Clear conditions throughout the day with afternoon rain. 2012	59°/83°	-	44°
2011 Casper Marathon Clear conditions throughout the day. 2011	48°/85°	-	39°
2010 Casper Marathon Clear conditions throughout the day. 2010	50°/74°	-	47°
2009 Casper Marathon Cloudy skies throughout the day with rain. 2009	40°/48°	Light	40°
2008 Casper Marathon Partly cloudy throughout the day. 2008	41°/63°	-	26°
2007 Casper Marathon Clear conditions throughout the day. 2007	48°/71°	-	46°
2006 Casper Marathon Clear conditions throughout the day. 2006	55°/85°	-	44°
2005 Casper Marathon Clear conditions throughout the day. 2005	52°/72°	-	39°
2004 Casper Marathon Clear conditions throughout the day. 2004	70°/91°	-	37°
2003 Casper Marathon Partly cloudy throughout the day with late afternoon rain. 2003	52°/72°	-	49°

More WY Races

Med Bow Rail Marathon

2026-08-15 · Laramie, WY, USA

Green River Run With the Horses

2026-08-15 · Green River, WY, USA

Jackson Hole Marathon

2026-09-26 · Jackson Hole, WY, USA