Lake Sonoma TS 13.1 Mile is the 21.0km trail race at Lake Sonoma 2026 (Geyserville, United States). The race starts on April 11, 2026.
The course climbs 710m+. With 34m/km of climbing, this is a rolling, mostly runnable course. By gradient, 34% of the distance is uphill, 38% downhill and 28% flat. Surface: 87% trail and 6% road. Flat-equivalent effort: 23.8 FlatKM.
The course is runnable enough that trekking poles are not needed.
Quad damage risk is low (index 10 of 100): a few descents worth noting, none of them decisive.
On race day, start temperatures have historically ranged from 10°C to 15°C, with around 13°C at the highest point; the chance of precipitation is about 24%. Heavy rain of 10.0mm or more falls on about 7% of days around this date.
128 finishers completed the 2026 edition. Women's winner: Evelin Ramirez (United States) in 1:54:49.
This page has the full results and splits, a pacing and nutrition planner, a gradient matrix, an interactive elevation profile and historical weather for Lake Sonoma TS 13.1 Mile.
Other distances of Lake Sonoma 2026Lake Sonoma LS 100k (100km)·Lake Sonoma LS 50k (50.0km)
