Calw-Altburg, Germany · Sunday, December 20, 2026

Fixed Distance 50K

Wald(Ultra)Marathon Calw

95 days away

46 km Distance

1,100 m Climbing

4.0 Grit · Challenging

48.7142° N, 8.7403° E© OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 24 m / km Rolling. Moderate undulations. Requires consistent effort across varying grades.

Time limit 8 hours 10:26 min/km average. Generous. Walkable throughout for most of the field. Tighter than 74% of 50K races. Measured against 1007 races of the same distance. Cut-off calculator →

Field size ~17 Tiny. You will run alone for most of it.

DUV results for the 2025 edition (46km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, December

Daytime high 3°C

Night low -3°C

Rainfall Mostly dry

Daylight 8 h 16 m of light

Regional 2001-2020 average for December — NASA POWER, grid elevation 556 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 46 km of trail with 1,100 m of ascent.

Trail Running Shoes24 m of climb per kilometre — grip and rock protection before cushioning.
Race Nutrition46 km of self-supported fuelling between aid stations.
Hydration VestsPole attachment and chest-strap stability on steep ground.
Trekking Poles1,100 m of ascent to walk up.
GPS WatchesBattery life first — a 46 km day outlasts most full-GPS modes.

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

Adidas