He faced a maximum of 30 years in prison.
Herrin was the driver of a Ford Mustang that collided with a mother and daughter on Bayshore Boulevard in 2018, as Herrin, who was then 18, was racing another driver, John Barrineau.
Herrin has left it up to judge to decide what his penalty should be.
The Mustang hit Jessica Reisinger-Raubenolt, who was pushing her 21-month-old daughter, Lillia, in a stroller across the iconic Tampa roadway.