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.

Race information

50 km
50k
25 km
25k
10 km
10k
5 km
Visit the organization's website for the most recent information.
Trail runs nearby

The Sunrise 5k in Wyoming, MN, is a community-focused running event held on the Sunrise Trails across from Casey's General Store. Participants can run, jog, walk, or even bring along a baby stroller or a dog for the 5-kilometer course. The event supports the Wyoming Lions, with proceeds benefiting l..

The Utepils Trail Loppet is an urban trail running event on September 21, 2025 in Theodore Wirth Park, Minneapolis. The Sunday program includes three race distances: Half Marathon 10K 5K All Sunday race courses start at the Trailhead and finish at Utepils Brewing. Proceeds benefit the Loppet Foun..

The Night Owl 6 Hour Shuffle is part of the Night Owl Races held at Lake Elmo Park Reserve in Minnesota. This event offers a unique ultra running experience where participants run as far as possible within six hours on grassy ski trails featuring rolling hills. Runners can choose between a 3.3-mile..

The Trout Brook is a challenging 10-mile trail race held at Willow River State Park in Hudson, Wisconsin. The course features a mix of wide-open park trails and technical single-track paths, including hills, a stair climb, and scenic views of a majestic waterfall. Designed for experienced trail runn..

Set along the Gandy Dancer State Trail in Luck, Wisconsin, the Gandy Dancer Marathon is an autumn running weekend offering a Marathon (Boston Qualifier), Half Marathon, 5k, Marathon Relay, and Kids Fun Run. The flat limestone trail starts and finishes near the Luck Fire Department, with a route visi..

Great Pumpkin Chase is a fall-themed trail running event held at Lake Elmo Park Reserve in Minnesota. The family-friendly race offers 10k, 5k, and a half-mile Kids Trail Fun Run, with a Double Up option for completing the 10k and then the 5k. Participants enjoy a scenic trail course through the park..