Course
All races start at the William O'Brien State Park Visitor Center, 16821 O'Brien Trail N, Marine on St Croix. The 50K covers two 25K loops through the park's upper and south sections and Jackson Meadows. The 5K and 10K use wide grass trails with one substantial hill and a flat finish. The 25K course was listed as still to be determined at the time of checking.
Key dates
- ★Race daySeptember 2027 · date to be announced
About
O'Brien Trail Races run through William O'Brien State Park in Marine on St. Croix, Minnesota, with 5K, 10K, 25K and 50K options on wooded trails above the St. Croix River. The park's mix of prairie, woods and river bluffs makes for a varied ultra-distance day.
Save O'Brien Trail Races to your season and RunCalendar reminds you the morning entries open and before they close. Free on iPhone, no account needed.
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In Yan Teopa 5 and 10-miler
Trail race high above Lake Pepin at Frontenac State Park
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Ely Marathon
Ely Marathon has a canoe-portaging division
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Big Woods Run
Passes historic falls in an old-growth Minnesota forest
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A confirmed date shows its day; a provisional one shows only its month, because we won't claim a day we don't have. This page is rebuilt every night from the RunCalendar catalogue.