Västerås, Sweden · Saturday, September 19, 2026

Fixed Distance 100 mi

Black River Run 100 Miles

3 days to go
161 km Distance
not publishedn/a Climbing
8.1 est Grit · Hardcore

Calculated from 161 km alone — the organiser has not published an elevation profile. Read 8.1 as a floor, not a verdict.

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59.6162° N, 16.5528° E© OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Time limit 30 hours 11:11 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 Climbing is unpublished, so this pace is a ceiling on the effort, not a measure of it.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 70% of 100 mi races. Measured against 30 races of the same distance. Cut-off calculator →
Field size ~35 Small. Long stretches with nobody in sight.

DUV results for the 2025 edition (170km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, September

Daytime high 17°C
Night low 9°C
Rainfall Mostly dry
Daylight 12 h 38 m of light

Regional 2001-2020 average for September — NASA POWER, grid elevation 47 m. Not a forecast.

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
🥤 nutrition

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

By UltraHub Expert

Gear for this race

Chosen for 161 km of trail.

  • Trail Running Shoes161 km of trail — cushioning that is still there in the last quarter.
  • Race NutritionPast 161 km the palate quits before the legs do — carry more than one flavour.
  • Hydration VestsFlask capacity for 161 km, without the bounce.
  • HeadlampsA 30 h limit puts you out there after dark.
  • AccessoriesChafe and blisters end more 161 km races than fitness does.

Salomon

Aero Glide 4 Grvl

$159.95 ★★★★★ 4.5

Asics

Trabuco Max 3

★★★★★ 4.6

Tailwind

Endurance Fuel

All-in-one calorie and electrolyte drink mix. 200 calories per serving.

$25 ★★★★★ 4.8

Nathan

VaporKrar 12L

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

$170 ★★★★★ 4.6

Petzl

NAO RL

1500-lumen reactive lighting headlamp with 15-hour runtime. Automatic brightness adjustment.

$150 ★★★★★ 4.7

Buff

CoolNet UV+ Multifunctional

UPF 50+ neck gaiter with cooling technology. Desert and sun essential.

$25 ★★★★★ 4.5
All gear guides →

Course Notes

10 mile laps on trail and gravel through the forest and along a small river.

Similar races

Other 100 mi trail ultras, closest in distance first.