The 2019 Lake Sonoma 50 will be held on Saturday, April 13. Registration is by lottery. The lottery application period is open now from December 1-15, 2018 at ultrasignup.com. Lottery results will be posted by December 17.
The race is held on the rugged trails at Lake Sonoma, about 10 miles northwest of Healdsburg, California. The course is 86% single track and 9% dirt roads, with the first 2.4 miles on a paved country road. The race starts at 6:30 am and has a 14-hour time limit.