The Children’s Bureau, within the Administration for Children and Families (U. S. Department of Health and Human Services) is funding a multi-phase grant program to build the evidence base on what works to prevent homelessness among youth and young adults who have been involved in the child welfare system. This program is referred to as Youth At-Risk of Homelessness (YARH). Eighteen organizations received funding for the first phase, a two year planning grant (2013 – 2015). Grantees used the planning period to conduct data analyses to help them understand their local population and develop a comprehensive service model to improve youth outcomes related to housing, education and training, social well-being, and permanent connections. Six of those organizations received funding to refi ne and test their comprehensive service models during the second phase, a three-year initial implementation grant (2015 – 2018).