Millston, WI, United States · Saturday, October 17, 2026

Fixed Distance 50K

Black River Trail Classic 50 Km

17 days to go

50 km Distance

not publishedn/a Climbing

2.5 est Grit · Entry level

Calculated from 50 km alone — the organiser has not published an elevation profile. Read 2.5 as a floor, not a verdict.

44.1930° N, 90.6476° W © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Time limit 9 hours 10:48 min/km average. Generous. Walkable throughout for most of the field. Climbing is unpublished, so this pace is a ceiling on the effort, not a measure of it. Tighter than 71% of 50K races. Measured against 1034 races of the same distance. Cut-off calculator →

Field size ~22 Small. Long stretches with nobody in sight.

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 14°C

Night low 3°C

Rainfall Mostly dry

Daylight 10 h 59 m of light

Regional 2001-2020 average for October — NASA POWER, grid elevation 301 m. Not a forecast.

Results history

Year	Race	Finishers	Men's winner	Women's winner
2025	50km	22	Charlie Schafer · 04:40:46	Jenny Fox · 05:57:59
2024	50km	13	Kyle Robinson · 04:52:07	Marisa Lanker · 05:51:11
2023	50km	23	Jeffrey Lanners · 03:59:42	Tanya Hall · 05:06:09
2022	50km	19	Steven Lavelle · 04:18:24	Jannette Rho · 05:52:03
2021	50km	14	Cole Agar · 05:34:35	Catherine Lee · 06:52:15
2020	50km	8	Patrick Lowder · 05:43:42	Suzie Brashler · 05:18:27
2019	50km	47	Matt Stoltz · 04:22:00	Mychelle Ehli · 05:25:37
2018	50km	43	Jason Wesolowski · 04:11:07	Jessa Hackman · 04:29:59
2017	50km	34	Travis Harvieux · 04:37:27	Jenna Staff · 05:03:42

The field grew 69% between 2024 (13) and 2025 (22). 41% 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

👟 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.

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

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

Spring Energy

Awesome Sauce

Real food gel with 180 calories. Rice-based with natural flavors.

$4 ★★★★★ 4.6

Salomon

ADV Skin 12

Industry-standard 12L race vest with front flask pockets and minimal bounce.

$180 ★★★★★ 4.8

Garmin

Enduro 3

Ultra-endurance GPS watch with solar charging and 300+ hour battery in GPS mode.

$900 ★★★★★ 4.8

All gear guides →

Overview

The Black River Trail Classic 50 Km, organised by nurun co., is a 50k trail race held in Millston, WI, United States. With 9 editions since 2017, the race has a field size bigger than 34% of its 2662 peer 50k races.

Runners have 9 hours to complete the 50-kilometer course, which implies a cutoff pace of 10.8 minutes per kilometer. This time limit is tighter than 60% of 1022 peer 50k races, making it a challenging course for those who need more time. The course description notes a runnable first half and a hilly second half. The entry fee is US$ 68.

Similar races

Other 50K trail ultras, closest in distance first.