This article compares the effects of indeterminate and determinate sentencing models on recidivism using a measure of parole board discretionary release and mandatory parole release under each sentencing model. Data collected from Recidivism of Prisoners Released in 1994: United States are used to conduct a state-specific comparison of the two release programs in six mixed-sentencing states. The results indicate that the effects of different sentencing models significantly vary across the six states. Whereas mandatory parole release was more likely to have a deterrent effect on recidivism in Maryland and Virginia, parole board discretionary release was more effective in New York and North Carolina. Release programs in Oregon and Texas showed no significant differences in their effects on recidivism.