Youth involved in both the child welfare and juvenile justice systems — sometimes referred to as crossover, dually-involved, dually-adjudicated, or dual-system youth — require a special focus. An intentional approach is needed because involvement in both systems is associated with higher risks for mental health, educational, and vocational challenges, higher rates of recidivism, longer stays in detention, and poorer placement stability and permanency outcomes. This blogpost illustrates the Crossover Youth Practice Model (CYPM) to address the needs of this population. It outlines the three phases of implementing the CYPM by identifying policies, programs, and practices that will enhance how a community supports crossover youth. More than 120 counties in 23 states have implemented or are in the process of implementing the CYPM as of 2022; the blogpost references reports on lessons learned in using this approach in Harris County, Texas, eastern Idaho, and Los Angeles County, California.