82.9 kmTrail🇺🇸 Geyserville, United States

Lake Sonoma 50

Saturday, 17 October 2026In 6 days · Start 06:30

A classic of American trail ultrarunning, now moved to autumn as part of the Sonoma Fall Classic: rolling, creek-crossed singletrack around Lake Sonoma in wine country, reviving the original 2008 course.

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Facts checked 10 Oct 2026 against aravaiparunning.com.

Elevation gain

3,235 m

Mountain · ↓ 3,235 m

Start altitude

146 m

above sea level, from terrain data

Temp at start

12°C

Peaks around 21°C

Entry fee

≈ $235

Open entry

Finishers

—

typical year

Course

Loop

16h cut-off

Getting thereFly into SMF (Sacramento), about 123 km from the start

Course map

A detailed route is not available for this race yet. The marker shows the race location.

Elevation profile

Mountain: about 3,235 m of climbing and 3,235 m of descent. A detailed profile isn’t available for this race yet.

Race-day weather

At start

12°C

Peak during race

21°C

Humidity

68%

Chance of rain

Wind

6 km/h

Race day in past years

Historical averages for 17 October ±3 days, 2016–2025, from 06:30 for 5 hours (70 days sampled). Source: Open-Meteo / ERA5.

Course records

Men: 5:51:16 · Jim Walmsley (2018)
Women: 7:08:23 · Stephanie Howe (2015)

As of the 2025 season.

What time could you run here?Adjust your goal time for this course’s hills and typical race-day weather.Race time calculator →

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<a href="https://irun42.com/race/lake-sonoma-50" title="Lake Sonoma 50 on iRun42"><img src="https://irun42.com/badge/lake-sonoma-50.svg" width="300" height="120" alt="Lake Sonoma 50: course, elevation and race-day weather on iRun42" /></a>