Calabasas, CA, United States · Saturday, January 23, 2027

Fixed Distance 50 mi

Sean OBrien 50 Mile Trail Race

129 days away

80 km Distance

3,000 m Climbing

8.5 Grit · Elite / extreme

34.1578° N, 118.6384° W© OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 38 m / km Rolling. Moderate undulations. Requires consistent effort across varying grades.

Time limit 15 hours 11:15 min/km average. Generous. Walkable throughout for most of the field. About average for a 50 mi. Measured against 455 races of the same distance. Cut-off calculator →

Field size ~69 Mid-sized. Company early, well spread out by halfway.

DUV results for the 2026 edition (50mi) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, January

Daytime high 17°C

Night low 10°C

Rainfall Showers likely

Daylight 10 h 17 m of light

Regional 2001-2020 average for January — NASA POWER, grid elevation 183 m. Not a forecast.

The Aid Station

Course-specific beta from the community

⛰️ terrain

This is a rolling 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

Gear for this race

Chosen for 80 km of trail with 3,000 m of ascent.

Trail Running Shoes38 m of climb per kilometre — grip and rock protection before cushioning.
Race Nutrition80 km of self-supported fuelling between aid stations.
Hydration VestsPole attachment and chest-strap stability on steep ground.
Trekking Poles3,000 m of ascent to walk up.
HeadlampsA 15 h limit puts you out there after dark.

Adidas