Suprasl, Poland · Saturday, October 3, 2026

Fixed Distance 50 mi

Bison Ultra-Trail 70

3 days to go

70 km Distance

600 m Climbing

4.4 Grit · Challenging

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

What the course asks

Climbing rate 9 m / km Fast & Flat. This course is relatively flat and fast. Ideal for PB attempts.

Time limit 11 hours 9:26 min/km average. Comfortable. Room to walk the climbs and stop at aid. Tighter than 81% of 50 mi races. Measured against 471 races of the same distance. Cut-off calculator →

Field size ~96 Mid-sized. Company early, well spread out by halfway.

DUV results for the 2025 edition (70km) — 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	70km	96	Dariusz Grzebski · 05:39:07	Ewa Lisek · 07:05:10
2024	70km	123	Przemyslaw Wozniak · 05:48:32	Justyna Kostrzewska-Warminska · 05:58:22
2023	70km	92	Marcin Torzewski · 05:45:24	Ewa Pazula · 06:11:29
2022	70km	105	Sylwester Jakacki · 05:33:23	Katarzyna Dordzik · 06:59:05
2021	70km	68	Damian Krysztofiak · 05:39:04	Agnieszka Jackowiak · 07:39:48
2020	50km	271	Krzysztof Wojcik · 03:58:28	Pawel Miniuk · 04:13:08

The field shrank 22% between 2024 (123) and 2025 (96). 23% of the 2025 field were women.

DUV results for the 2025 edition (70km) — 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 70 km of trail with 600 m of ascent.

Trail Running Shoes 70 km of trail — cushioning that is still there in the last quarter.
Race Nutrition 70 km of self-supported fuelling between aid stations.
Hydration Vests Flask capacity for 70 km, without the bounce.
GPS Watches Battery life first — a 70 km day outlasts most full-GPS modes.

Adidas

Terrex Agravic Speed Ultra

RunRepeat found the Adidas Terrex Agravic Speed Ultra to be perfect for midfoot and forefoot strikers, while iRunFar noted that the shoe feels incredibly effici…

★★★★★ 4.5

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

Maurten

Gel 100

Hydrogel technology for 25g carbs per gel with minimal GI distress.

$3.5 ★★★★★ 4.7

Nathan

VaporKrar 12L

12L race vest co-designed with ultra champion Rob Krar, with insulated bladder pocket.

$170 ★★★★★ 4.6

Suunto

Vertical

Titanium GPS watch with solar charging, offline maps, and 140-hour GPS battery.

$630 ★★★★★ 4.5

All gear guides →

Overview

The Bison Ultra-Trail 70, a 50-mile trail race in Suprasl, Poland, offers a flatter course than most, with 8.6 meters of climb per kilometer over its 70 km. This is an established event, having been run 6 times since 2020. With 96 finishers in the latest edition, it draws a larger field than 73% of its 50-mile peer races.

The 11-hour time limit is tighter than 81% of 50-mile races, requiring a pace under 9.4 minutes per kilometer to finish. This limit gives runners less margin than most 50-mile events.

Similar races

Other 50 mi trail ultras, closest in distance first.