Lake Sonoma 50 is a 50-mile ultra marathon race held near Healdsburg, California.
The course circumnavigates the Warm Springs arm of Lake Sonoma on hiking trails.
[1] Stocked with normal ultra aid station fare including GU energy gels and products.
[5] The race directors ask that participants limit their drop bag to the size of a small shoe box.
The first two men and women finishers of the Lake Sonoma 50 mile race are rewarded a guaranteed entry into the Western States Endurance run.