This quasi-experimental, pre-post study investigated the sustainability of risk-needs assessment (RNA) and the risk-need-responsivity (RNR) practices in five juvenile probation offices across two states 7 years after rigorous implementation. The study evaluated adherence to practices and facilitators of sustainability via interviews with leadership (N = 10) and probation officers (N = 84) and a seventh-year cohort of youth propensity score matched to a cohort from the first year of implementation (n = 730 per state cohort). Probation officers in both states reported relatively high adherence to RNR-based practices, and one state significantly improved adherence to its RNA administration policies and the risk principle. Adherence to the risk principle in placement and service referral decisions regressed in the other state. Essential ingredients for sustainment included maintaining staff training and monitoring, evolving RNR practices through the adoption of complementary evidence-based practices, and having court personnel who enable best practices.