O'Brien Trail Races 50K

50K · Marine on St. Croix, MN, US · 2026-09-26 · registration

Course

Distance31.1 mi
Distance (metric)50.0 km“50K ... Entry: $40 (11/28-12/2/25), $55 (12/3/25-7/31/26), $65 (8/1-9/21/26), $75 (race day)” source
Course typemulti-loop“50K (two 25k loops)” source
Net elevation0 ft“50K (two 25k loops)” source
Terrainforest, prairie“rolling glacial moraine, riparian zones, restored oak savanna, wooded areas and bogs ... restored prairie habitat alongside mature forests” source

Getting there

Nearest townMarine on St. Croix“William O'Brien State Park, 16821 O'Brien Trail North, Marine on Saint Croix, Minnesota” source
StateMN“William O'Brien State Park, 16821 O'Brien Trail North, Marine on Saint Croix, Minnesota” source
CountryUS“William O'Brien State Park, 16821 O'Brien Trail North, Marine on Saint Croix, Minnesota” source
Race starts atWilliam O'Brien State Park“Registration and parking at Visitor Center lot” source
Nearest major airportMSP“The route resolves between Minneapolis Airport (MSP) in Minneapolis, USA and William O'Brien State Park in Marine on St Croix, Minnesota, USA. The road distance is 38.2 miles.” source
Driving distance to airport38.2 mi“The road distance is 38.2 miles.” source

Race day

Date2026-09-26
Start time08:00
Entry fee$65
Aid stations8
Drop bagsyes
Runners100

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