Healdsburg, CA, United States · Saturday, October 17, 2026

Fixed Distance 100 mi

Sonoma Fall Classic

31 days away

161 km Distance

3,200 m Climbing

10.0 Grit · Elite / extreme

38.6105° N, 122.8692° W© OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 20 m / km Rolling. Moderate undulations. Requires consistent effort across varying grades.

Time limit 14 hours 5:13 min/km average. Tight. You are racing the clock from the start. Among the tightest 100 mi cut-offs we track. Measured against 30 races of the same distance. Cut-off calculator →

Field size ~142 Mid-sized. Company early, well spread out by halfway.

DUV results for the 2025 edition (50mi) — 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 21°C

Night low 11°C

Rainfall Mostly dry

Daylight 11 h 11 m of light

Regional 2001-2020 average for October — NASA POWER, grid elevation 173 m. Not a forecast.

The Aid Station

Course-specific beta from the community

⛰️ terrain

This is a rolling course. Expect fast, runnable sections where rhythm is key.

By UltraHub Expert

👟 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 with 3,200 m of ascent.

Trail Running Shoes20 m of climb per kilometre — grip and rock protection before cushioning.
Race NutritionPast 161 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.

Asics