Ultra Running Hub Woodside, CA, United States · Sunday, January 17, 2027
Fixed Distance 50K
Crystal Springs 50 km Winter Trail Run
123 days away
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.
What the course asks
Time limit 8.5 hours
10:12 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 Climbing is unpublished, so this pace is a ceiling on the effort, not a measure of it.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 77% of 50K races. Measured against 1007 races of the same distance. Cut-off calculator →
Field size ~30 Small. Long stretches with nobody in sight.
DUV results for the 2026 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, January
Daytime high 13°C
Night low 8°C
Rainfall Mostly dry
Daylight 9 h 53 m of light
Regional 2001-2020 average for January — NASA POWER, grid elevation 66 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 50 km of trail.
- Trail Running Shoes50 km of trail — cushioning that is still there in the last quarter.
- Race Nutrition50 km of self-supported fuelling between aid stations.
- Hydration VestsFlask capacity for 50 km, without the bounce.
- GPS WatchesBattery life first — a 50 km day outlasts most full-GPS modes.
Course Notes
Experience the towering redwoods, lush ferns, and beautiful trails through Huddart Park, King's Mountain and Bear Gulch.
Similar races
Other 50K trail ultras, closest in distance first.