Ultra Running Hub Sandviken, Sweden · Saturday, October 3, 2026
Fixed Distance 50 mi
Björnfrossa Ultramaraton
17 days to go
65 km Distance
not publishedn/a Climbing
3.3 est Grit · Challenging
Calculated from 65 km alone — the organiser has not published an elevation profile. Read 3.3 as a floor, not a verdict.
What the course asks
Time limit 12 hours
11:05 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 Climbing is unpublished, so this pace is a ceiling on the effort, not a measure of it. About average for a 50 mi. Measured against 455 races of the same distance. Cut-off calculator →
Field size ~97 Mid-sized. Company early, well spread out by halfway.
DUV results for the 2025 edition (65km) — 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 8°C
Night low 3°C
Rainfall Mostly dry
Daylight 11 h 22 m of light
Regional 2001-2020 average for October — NASA POWER, grid elevation 79 m. Not a forecast.
The Aid Station
Course-specific beta from the community
With trail terrain, choose a shoe with moderate cushioning for optimal performance.
Gear for this race
Chosen for 65 km of trail.
- Trail Running Shoes65 km of trail — cushioning that is still there in the last quarter.
- Race Nutrition65 km of self-supported fuelling between aid stations.
- Hydration VestsFlask capacity for 65 km, without the bounce.
- HeadlampsA 12 h limit puts you out there after dark.
- GPS WatchesBattery life first — a 65 km day outlasts most full-GPS modes.
Course Notes
65km on marked trail in Gästrikland's bear country in the middle of Sweden.
Similar races
Other 50 mi trail ultras, closest in distance first.