In spring 2016, we searched state education agency websites to document existing state-adopted definitions of kindergarten readiness and KEAs. The results were compiled into a 50-state scan that we shared with our partnership members. The findings include: As of June 2016, 26 states had a definition of kindergarten readiness that was either formally adopted or promoted throughout the state; Of the states that did not yet have a definition, six were developing one; Most states use KEAs for at least one of the following purposes: To inform classroom instruction, curriculum planning, and professional development needs; To identify students in need of specialized supports or interventions; To provide a statewide snapshot of what children know when they enter kindergarten, monitor changes over subsequent kindergarten cohorts, and inform public policy and public investments in early childhood. (author abstract)