Suprasl, Poland · Saturday, October 3, 2026

Fixed Distance 100K

Bison Ultra-Trail 100

3 days to go

104 km Distance

1,159 m Climbing

6.9 Grit · Hardcore

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

What the course asks

Climbing rate 11 m / km Fast & Flat. This course is relatively flat and fast. Ideal for PB attempts.

Time limit 16 hours 9:14 min/km average. Comfortable. Room to walk the climbs and stop at aid. About average for a 100K. Measured against 214 races of the same distance. Cut-off calculator →

Field size ~267 Large. Rarely out of sight of another runner.

DUV results for the 2025 edition (104km) — 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	104km	267	Tomasz Szalachowski · 08:49:23	Anna Psuja · 09:58:51
2024	104km	186	Adam Onoszko · 09:07:03	Ewa Pazula · 10:16:37
2023	104km	178	Sebastian Skowron · 09:51:43	Ewelina Kuklik · 11:20:56
2022	104km	139	Tomasz Cyganski · 09:14:27	Joanna Oberlan-Maron · 10:36:26
2021	100km	114	Szymon Jackowiak · 09:36:40	Angelika Pilakowska · 12:03:12
2020	100km	100	Kamil Dwornicki · 09:30:52	Ewa Wardak · 12:22:00

The field grew 44% between 2024 (186) and 2025 (267). 21% of the 2025 field were women.

DUV results for the 2025 edition (104km) — 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

🥤 nutrition

For 100km+ efforts, prioritize real food at aid stations to prevent palate fatigue.

By UltraHub Expert

Gear for this race

Chosen for 104 km of trail with 1,159 m of ascent.

Trail Running Shoes 104 km of trail — cushioning that is still there in the last quarter.
Race Nutrition Past 104 km the palate quits before the legs do — carry more than one flavour.
Hydration Vests Flask capacity for 104 km, without the bounce.
Headlamps A 16 h limit puts you out there after dark.
Accessories Chafe and blisters end more 104 km races than fitness does.

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

La Sportiva

Prodigio Pro

RunRepeat found the La Sportiva Prodigio Pro to have a secure, locked-in fit due to its premium upper, and also praised the shoe's energetic ride, particularly…

$225 ★★★★★ 4.6

Spring Energy