Black River Run 100 Miles

Race completed

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.

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 Climbing is unpublished, so this pace is a ceiling on the effort, not a measure of it.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.

Results history

Year	Race	Finishers	Men's winner	Women's winner
2025	170km	35	Thomas Isberg · 16:25:09	Åsa Emanuelsson · 20:15:34
2024	161km	34	Gustaf Sjösvärd · 14:05:56	Jenny Stengård · 19:46:01
2023	100mi	31	Gustaf Sjösvärd · 15:50:18	Linda Wiese · 17:57:43
2022	184km	40	Gustaf Sjösvärd · 17:09:08	Anna Grundahl · 18:56:15
2021	100mi	49	Magnus Rabe · 14:52:52	Yann Hellman · 20:11:00
2019	100mi	60	Gustaf Sjösvärd · 16:18:49	Patrizia Strandman · 17:51:51
2018	100mi	50	Stellan Fries · 15:38:21	Karolina Biwall Hellman · 20:25:52
2017	100mi	35	Anders Hellner · 16:39:55	Henriette Karoline Brynthe · 17:02:59
2016	100mi	33	Johnny Hällneby · 16:39:14	Lena Jakobsson · 18:47:22
2015	100mi	22	Niklas Holmström · 16:31:22	Gunilla Axelsson · 18:53:06

The field has held steady: 34 in 2024, 35 in 2025. 29% of the 2025 field were women.

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.

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 Shoes 161 km of trail — cushioning that is still there in the last quarter.
Race Nutrition Past 161 km the palate quits before the legs do — carry more than one flavour.
Hydration Vests Flask capacity for 161 km, without the bounce.
Headlamps A 30 h limit puts you out there after dark.
Accessories Chafe and blisters end more 161 km races than fitness does.