Ultra Running Hub Jelenia Gora, Sobieszow, Poland · Saturday, September 5, 2026
Fixed Distance 50K
Chojnik Karkonoski Festiwal Biegowy
Race completed
50 km Distance
5,100 m Climbing
10.0 Grit · Elite / extreme
What the course asks
Climbing rate 102 m / km
Vertical. Extreme verticality. This is a technical mountain course with sustained steep grades.
Time limit 20 hours
24:00 min/km average. Generous. Walkable throughout for most of the field. Among the most forgiving 50K cut-offs we track. Measured against 1007 races of the same distance. Cut-off calculator →
Field size ~77 Mid-sized. Company early, well spread out by halfway.
DUV results for the 2023 edition (101.5km) — 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 18°C
Night low 9°C
Rainfall Mostly dry
Daylight 13 h 21 m of light
Regional 2001-2020 average for September — NASA POWER, grid elevation 361 m. Not a forecast.
The Aid Station
Course-specific beta from the community
This is a vertical course. Poles are highly recommended for the sustained climbs.
With trail terrain, choose a shoe with moderate cushioning for optimal performance.
Gear for this race
Chosen for 50 km of trail with 5,100 m of ascent.
- Trail Running Shoes102 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 Poles5,100 m of ascent to walk up.
- HeadlampsA 20 h limit puts you out there after dark.
Similar races
Other 50K trail ultras, closest in distance first.