Beyond the Minimum: How Long Do Idaho Prisoners Serve Beyond Their Determinate Sentences?

Under the Idaho Unified Sentencing Act, individuals sentenced to prison receive both a broad indeterminate sentence and a minimum determinate sentence, which they must serve before becoming eligible for parole. This unique sentencing structure raises an important question: How long are individuals in Idaho’s prisons actually staying past their determinate sentence? Despite its significance, this question remains largely unanswered due to limited research, restricted public access to sentencing data, and the complexity of criminal justice legislation, which makes it difficult for the general public to understand. Parole boards ultimately have the discretion to release individuals after their mandatory sentence based on various factors, including offense severity, behavior, and risk assessments. To address this gap in information, this study examines all individuals released from Idaho prisons in 2023. In partnership with the Idaho Department of Corrections, I analyzed the proportion of indeterminate sentences served, how long individuals remained incarcerated compared to their full sentence, and how these patterns varied by crime type. The findings provide essential insights into sentencing outcomes in Idaho, along with policy recommendations, study limitations, and directions for future research.