The Children’s Bureau, within the Administration for Children and Families (U.S. Department of Health and Human Services), funded 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. Known as Youth At-Risk of Homelessness (YARH), this program funded 18 organizations for the first phase for two years. This brief discusses how the YARH Phase I grantees adopted the data strategy from The Framework to End Youth Homelessness: A Resource Text for Dialogue and Action that the U.S. Interagency Council on Homelessness (USICH) developed in 2013. The grantees used the data strategy to better understand the size and characteristics of homeless populations in their service area. The information in this brief was gleaned from grantee applications for Phase I and Phase II and additional grantee papers and presentations. (author abstract modified)