The Chevrolet Astro van went over an embankment on Guerneville Road, east of Laguna Road, at about 5:10 a.m., CHP Officer Jonathan Sloat said.
The van overturned several times, ejecting one man, who was pronounced dead at the scene, Sloat said. The Sonoma County coroner's office has not yet released his name because his family has not been notified.
The male driver fled the scene after the crash, Sloat said.
Two Santa Rosa men -- 34-year-old Domingo Layata-Mendez and 26-year-old Nahum Avendano, 26 -- were hurt in the crash, as was a 17-year-old Piner High school student, Ignacio Hernandez-Rubio, of Santa Rosa, Sloat said.
The two men suffered head injuries and lacerations and were transported to Santa Rosa Memorial Hospital, Sloat said.
Hernandez-Rubio suffered a broken leg and was taken to Kaiser Permanente Medical Center in Santa Rosa, Sloat said.
All three are expected to survive, Sloat said.
Hernandez-Rubio and the man who was killed were not wearing seat belts, Sloat said.
The occupants of the van, who worked for Mid-Valley Labor Services of Madera, were on their way to work at a farm near Occidental, Sloat said. A spokeswoman for the company declined to comment this morning.
The driver has not yet been found, Sloat said.