Trail Sisters Half Marathon is the 21.0km trail race at Lake Sonoma 2027 (United States). The race starts on April 10, 2027.
The course climbs 710m+. With 34m/km of climbing, this is a rolling, mostly runnable course. By gradient, 36% of the distance is uphill, 35% downhill and 29% flat. Surface: 85% trail. Flat-equivalent effort: 23.7 FlatKM.
The course is runnable enough that trekking poles are not needed.
Quad damage risk is low (index 11 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 12°C at the highest point; the chance of precipitation is about 26%. Heavy rain of 10.0mm or more falls on about 8% of days around this date.
This page has a pacing and nutrition planner, a gradient matrix, an interactive elevation profile and historical weather for Trail Sisters Half Marathon.
Other distances of Lake Sonoma 2027Lake Sonoma LS 100k (100km)·Lake Sonoma LS 50k (50.0km)
Other editions of Trail Sisters Half Marathon2026
Official websiterunlakesonoma.com
