O'brien Trail Races

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 50K, 25K, 10K, and 5K, catering to a range of trail runners from beginners to experienced athletes. The 50K consists of two 25K loops through the park's upper and south sections and Jackson Meadows, featuring four aid stations per loop.

The shorter 5K and 10K races run on wide grass trails with a notable hill and a flat finish. The atmosphere is family-friendly and welcoming, with official timing and post-race refreshments. The race emphasizes respect for fellow runners and the natural environment. Visit the organization's website for the most recent information.