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

Fixed Distance 50K

Sean OBrien 50 km Trail Race

129 days away

50 km Distance

2,000 m Climbing

5.5 Grit · Challenging

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

What the course asks

Climbing rate 40 m / km Mountain. Significant climbing. Steep sections will require power hiking.

Time limit 14 hours 16:48 min/km average. Generous. Walkable throughout for most of the field. More forgiving than 86% of 50K races. Measured against 1007 races of the same distance. Cut-off calculator →

Field size ~107 Mid-sized. Company early, well spread out by halfway.

DUV results for the 2026 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, 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 mountain 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 50 km of trail with 2,000 m of ascent.

Trail Running Shoes40 m of climb per kilometre — grip and rock protection before cushioning.
Race Nutrition50 km of self-supported fuelling between aid stations.
Hydration VestsPole attachment and chest-strap stability on steep ground.
Trekking Poles2,000 m of ascent to walk up.
HeadlampsA 14 h limit puts you out there after dark.

Brooks

Catamount 3

RunRepeat found the Brooks Catamount 3 to have a cozier upper that enhances the overall fit, though breathability and durability could be better. iRunFar noted…

★★★★★ 4.5

Adidas