Suprasl, Poland · Saturday, October 3, 2026

Fixed Distance 50K

Bison Ultra-Trail 50

3 days to go

50 km Distance

600 m Climbing

3.4 Grit · Challenging

53.2053° N, 23.3393° E © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 12 m / km Fast & Flat. This course is relatively flat and fast. Ideal for PB attempts.

Time limit 8 hours 9:36 min/km average. Comfortable. Room to walk the climbs and stop at aid. Tighter than 89% of 50K races. Measured against 1034 races of the same distance. Cut-off calculator →

Field size ~297 Large. Rarely out of sight of another runner.

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, October

Daytime high 11°C

Night low 3°C

Rainfall Mostly dry

Daylight 11 h 32 m of light

Regional 2001-2020 average for October — NASA POWER, grid elevation 142 m. Not a forecast.

Results history

Year	Race	Finishers	Men's winner	Women's winner
2025	50km	297	Krzysztof Tobjasz · 04:06:20	Olga Sarnacka · 05:00:01
2024	50km	256	Piotr Martyniuk · 03:44:39	Anna Wysoczanska · 04:36:52
2023	50km	250	Przemyslaw Wozniak · 04:07:12	Justyna Kostrzewska-Warminska · 04:20:32
2022	50km	269	Andrzej Miedziejewski · 04:00:17	Ewa Pazula · 04:40:02
2021	50km	254	Piotr Saniawa · 04:20:27	Katarzyna Szkoda · 04:15:17

The field grew 16% between 2024 (256) and 2025 (297). 23% 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

⛰️ terrain

This is a fast & flat 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 600 m of ascent.

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 Speed Ultra

RunRepeat found the Adidas Terrex Speed Ultra to have a grippy outsole and great lockdown, while iRunFar noted that the shoe works on a variety of trail conditi…

★★★★★ 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