La Grange, WI, United States · Sunday, November 8, 2026

Fixed Distance 50K

tBunk Endurance Challenge 50 Km

39 days away

50 km Distance

1,400 m Climbing

4.6 Grit · Challenging

41.8050° N, 87.8692° W © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 28 m / km Rolling. Moderate undulations. Requires consistent effort across varying grades.

Field size ~35 Small. Long stretches with nobody in sight.

DUV results for the 2025 edition (31.2mi) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, November

Daytime high 8°C

Night low -1°C

Rainfall Mostly dry

Daylight 10 h 08 m of light

Regional 2001-2020 average for November — NASA POWER, grid elevation 231 m. Not a forecast.

Results history

Year	Race	Finishers	Men's winner	Women's winner
2025	31.2mi	35	Murray Dunsirn · 04:10:46	Relena Ribbons · 04:31:38
2024	31.2mi	49	Luke Hallmark · 03:58:08	Christina Dodge · 04:45:01
2023	31.2mi	55	Luke Hallmark · 03:50:22	Relena Ribbons · 04:14:10
2022	31.2mi	51	Desmond Cariveau · 03:56:30	Anna Curtis · 04:38:05
2021	31.2mi	49	Samuel Hall · 04:11:52	Anna Curtis · 04:47:13
2020	31.2mi	33	John Papiernik · 03:43:05	Shannon Papiernik · 04:28:26
2019	31.2mi	46	Tanner Mann · 04:29:57	Margaret Arts · 05:07:30
2018	31.2mi	34	Andrew Miller · 04:29:44	Aygul Hoffman · 04:51:45
2017	31.2mi	29	John Zientko · 04:18:49	Christine Crawford · 04:51:10
2016	31.2mi	39	Lucas Henson · 04:21:23	Laurie Bunk · 05:43:15

The field shrank 29% between 2024 (49) and 2025 (35). 31% of the 2025 field were women.

DUV results for the 2025 edition (31.2mi) — 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 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 50 km of trail with 1,400 m of ascent.

Trail Running Shoes 28 m of climb per kilometre — grip and rock protection before cushioning.
Race Nutrition 50 km of self-supported fuelling between aid stations.
Hydration Vests Pole attachment and chest-strap stability on steep ground.
Trekking Poles 1,400 m of ascent to walk up.
GPS Watches Battery life first — a 50 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

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

Skratch Labs