OBrien 50 km Race

Race completed

50 km Distance

not publishedn/a Climbing

2.5 est Grit · Entry level

Calculated from 50 km alone — the organiser has not published an elevation profile. Read 2.5 as a floor, not a verdict.

45.1987° N, 92.7697° W © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Time limit 8 hours 9:36 min/km average. Comfortable. Room to walk the climbs and stop at aid. Climbing is unpublished, so this pace is a ceiling on the effort, not a measure of it. Tighter than 89% of 50K races. Measured against 1034 races of the same distance. Cut-off calculator →

Field size ~37 Small. Long stretches with nobody in sight.

DUV results for the 2025 edition (50km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, September

Daytime high 22°C

Night low 10°C

Rainfall Showers likely

Daylight 12 h 02 m of light

Regional 2001-2020 average for September — NASA POWER, grid elevation 318 m. Not a forecast.

Results history

Year	Race	Finishers	Men's winner	Women's winner
2025	50km	37	Robert Santoro · 03:58:24	Rachel Ragona · 04:20:43
2024	50km	43	Andrew Richardson · 03:40:45	Rachel Ragona · 04:15:12
2023	50km	42	Phil Wacker · 04:06:10	Michele Pelzer · 05:05:14
2022	50km	33	Andrew Turner · 04:11:27	Barbara Powell · 05:03:29
2021	50km	27	Jeff Rahman · 04:10:05	Tammi Braund · 04:38:54
2020	50km	27	Daniel Domres · 03:16:52	Anna Yurchenko · 05:11:08

The field shrank 14% between 2024 (43) and 2025 (37). 35% of the 2025 field were women.

DUV results for the 2025 edition (50km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

The Aid Station

Course-specific beta from the community

👟 gear

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

By UltraHub Expert

Gear for this race

Chosen for 50 km of trail.

Trail Running Shoes 50 km of trail — cushioning that is still there in the last quarter.
Race Nutrition 50 km of self-supported fuelling between aid stations.
Hydration Vests Flask capacity for 50 km, without the bounce.
GPS Watches Battery life first — a 50 km day outlasts most full-GPS modes.

Adidas

Terrex Agravic Speed Ultra

RunRepeat found the Adidas Terrex Agravic Speed Ultra to be perfect for midfoot and forefoot strikers, while iRunFar noted that the shoe feels incredibly effici…

★★★★★ 4.5

Salomon

Sense Ride 5

RunRepeat found the Salomon Sense Ride 5 to have immaculate lockdown and a smooth and stable ride, making it confident on moderate trails and steep downhills. I…

★★★★★ 4.5

Skratch Labs