Ultra Running Hub Healdsburg, CA, United States · Saturday, April 10, 2027
Lake Sonoma 100K & 50K
What the course asks
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, April
Regional 2001-2020 average for April — NASA POWER, grid elevation 173 m. Not a forecast.
The Aid Station
Course-specific beta from the community
This is a rolling course. Expect fast, runnable sections where rhythm is key.
With trail terrain, choose a shoe with moderate cushioning for optimal performance.
For 100km+ efforts, prioritize real food at aid stations to prevent palate fatigue.
Gear for this race
Chosen for 100 km of trail with 3,200 m of ascent.
- Trail Running Shoes32 m of climb per kilometre — grip and rock protection before cushioning.
- Race NutritionPast 100 km the palate quits before the legs do — carry more than one flavour.
- Hydration VestsPole attachment and chest-strap stability on steep ground.
- Trekking Poles3,200 m of ascent to walk up.
- HeadlampsA 14 h limit puts you out there after dark.
Course Notes
Location: Lake Sonoma, Healdsburg, CA. Surface: 86% single-track trails and 9% dirt roads, 5% pavement.
Similar races
Other 100K trail ultras, closest in distance first.