Casper, WY
Sunday, June 7, 2026




4.3 Stars from 3 ReviewsThe Casper Marathon offers a challenging high-altitude course. The route in run at an elevation between roughly 5,100 and 5,350 feet above sea level, altitude acclimation is a major factor in the overall difficulty for those not living or acclimated to altitude. The course is a combination of a loop and an out-and-back, featuring an elevation profile composed of rolling hills during the first half and primarily flat sections throughout the second half.
The entire course is run on paved terrain, with a surface breakdown of approximately 90% asphalt and 10% concrete. The race begins at the WYO Sports Ranch, which provides an indoor waiting space for runners before the start. From there, the course covers the rolling hills north of town, reaching its maximum elevation near 5,350 feet within the first few miles. Around miles 5 to 6, runners face a significant downhill drop as the layout descends into the city of Casper.
The remainder of the course transitions into flatter sections that weave through local historic sights and segments near a golf course. A significant portion of the later miles utilizes the Platte River Trails system. Along this river parkway, runners cross pedestrian bridges and follow the water, encountering a mix of occasional shaded relief, minor slopes, and fully exposed stretches. Because it is a smaller regional event, crowd support is generally quiet but highly supportive at key intersections.
A smart pacing strategy requires extreme patience during the rolling hills and high altitude of the opening miles. Runners who overextend themselves early often struggle with the thin air and sun exposure on the exposed river trail later on. While the second half is flat, the 5,000+ feet of elevation means this race is best suited for altitude-prepared runners, 50-state milestone chasers, and those who appreciate a scenic, community-oriented event along the river.
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Race Dates
2027: TBDCourse Information
Profile: Mostly FlatRace Day Weather
Mean Temp.: 60°F (15°C)PR Score & Course Score
PR Score: 93.77Race Size
2026: 89 FinishersBQ Percentages
2026: 2.3%Miscellaneous Information
Pace Groups?: No
Race Day Temperatures |
High: 81°F (27°C) |
Race Start Conditions |
58°F (14°C) |
PR Score |
93.22 |
Course Score |
93.77 |
The Casper Marathon was the 350th largest marathon in the U.S. in 2025 based on the number of finishers. In 2024, it ranked as the 365th largest marathon in the U.S..
In 2026, 2.3% of Casper Marathon finishers have achieved Boston Marathon qualifying times. In 2025, 5.5% of finishers qualified for the Boston Marathon.
Based on its percentage of Boston Qualifiers (BQs), the Casper Marathon ranked 262nd among marathons in the U.S. in 2025 and currently ranks 186th so far in 2026. In Wyoming, it ranked 1st in 2025 and 1st so far in 2026. These rankings provide a useful benchmark for comparing the Casper Marathon with other Boston Marathon qualifying races.
The Casper Marathon has a Course Score of 93.77, ranking it as the 442nd fastest marathon course in the U.S. and the 1st fastest marathon course in Wyoming.
Typical race-time temperature and humidity levels are within the ideal range for optimal marathon performance. Combined with the course profile, this gives the Casper Marathon a PR Score of 93.77. The PR Score ranks the Casper Marathon as the 434th best marathon in the U.S. for running a Personal Record (PR) and the 1st best marathon for a PR in Wyoming.
Together, these rankings provide a quick snapshot of how the Casper Marathon compares with other marathons in the U.S. and Wyoming for speed, PR potential, Boston Marathon qualifying success, and overall participation.
Max Elevation: 5351 feet (1631m)
Min Elevation: 5098 feet (1554m)
Elevation Gain: 548 feet (167m)
Elevation Loss: 743 feet (226m)
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