Race. Train. Gear up.
Saturday, September 26, 2026 Marine on St Croix, MN, USA
Trail 50k

OBrien 50 km Race

106 days away
50km Distance
2.5 Grit Score
Entry Level Level
Vertical Intensity 0 D+/km
Flat Hilly Mtn

This course is relatively flat and fast. Ideal for PB attempts.

The Aid Station

Course-specific beta from the community

⛰️ terrain

This is a fast & flat course. Expect fast, runnable sections where rhythm is key.

By UltraHub Expert
👟 gear

With trail terrain, choose a shoe with moderate cushioning for optimal performance.

By UltraHub Expert

Course Intelligence

OPENFREE MAP (LIBRE)

Course Notes

50k course will run the 10 mile course 3 times with one mile added at the end. Course is mainly a wide grass trail with rolling hills. The hills will add up over the 3 loops.