Sonoma Sun Event Calendar

Half Marathon at Trione-Annadel Trione-Annadel State Park

Saturday April 7th -

The Annadel Half Marathon comes to Trione-Annadel State Park on Saturday, April 7. Proceeds from the 13.1-mile race support trail maintenance in Trione-Annadel State Park. To volunteer to help with the event or to register to participate go to Some trails may be impacted by race participant traffic in the morning. All trails remain open to all users during the event.