7th O'Brien 50 km Race
7th O'Brien 50 km Race is a 50 km ultramarathon in Marine on St Croix, MN, United States, taking place on Sep 26, 2026. This edition has already taken place.
- Date
- Sep 26, 2026
- Distance
- 50 km
- Location
- Marine on St Croix, MN, United States
- Format
- Fixed distance