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O'brien Trail Races

Marine on Saint Croix, United States • 20 Sep 2025

O'Brien Trail Races are held at William O'Brien State Park, near Marine on Saint Croix, Minnesota. The event offers four distances: 50K, 25K, 10K, and 5K. The premier 50K course runs two 25K loops through the park’s upper and south sections and Jackson Meadows, with four aid stations per loop and a nine-hour time limit. The 5K and 10K are wide grass-trail courses featuring one large hill, with no aid stations, no awards, but a finish-print for all finishers. A family-friendly atmosphere, park setting, optional race shirts, and post-race refreshments round out the experience. 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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