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O'brien Trail Races

Marine on Saint Croix, United States • 20 Sep 2025

The O'Brien Trail Races take place at William O'Brien State Park in Marine on Saint Croix, Minnesota. The event offers multiple distances including a challenging 50K (two 25K loops), a 25K, a 10K, and a 5K, catering to a range of trail runners from beginners to experienced athletes. The courses feature scenic trails with varied terrain, including grass paths and hills, with aid stations providing refreshments on longer routes.

The atmosphere is family-friendly, encouraging new runners to participate, especially in the shorter distances. The race emphasizes respect for fellow runners and the natural environment, with no external music allowed unless using headphones. Post-race food and amenities are provided at the Visitor Center start/finish area. Visit the organization's website for the most recent information.

United States Minnesota Marine on Saint Croix

Race information

Registration Facebook
50 km
50k
25 km
25k
10 km
10k
5 km
Visit the organization's website for the most recent information.
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