This is the seventh in a series of Research-to-Impact briefs by Chapin Hall at the University of Chicago to understand and address youth homelessness. This brief highlights actions that child welfare systems, public systems, and nonprofit organizations can take to prevent young people who have experienced foster care from becoming homeless. It outlines the implications of four key child welfare policies and presents eight recommendations for policymakers, public system leaders, and practitioners to start discussing how to change laws, regulations, systems, and programs to prevent youth homelessness. (author abstract modified)