The Building and Sustaining the Child Care and Early Education Workforce (BASE) project aims to increase knowledge and understanding in child care and early education (CCEE) by documenting factors that drive workforce turnover and by building evidence on current initiatives to recruit, advance, and retain a stable and qualified CCEE workforce. As part of the BASE project, the study team completed a literature review and an environmental scan designed to identify and document existing knowledge about the CCEE workforce and strategies to strengthen it. The team also completed a data scan that documented and assessed the strengths and weaknesses of a range of potential data sources for examining workforce dynamics and addressing key gaps in the research identified by the literature review and environmental scan. This brief uses data from one of the sources identified in the data scan: state CCEE workforce registries. Using data from Montana's Early Care and Education (ECE) Workforce Registry, the brief addresses the following research questions: (1) What are the characteristics of the Montana ECE workforce? (2) What are retention rates in the ECE field, and how are they associated with teacher, job, and provider characteristics? and (3) How many teachers earn credentials over time, and how is credential attainment associated with teacher, job, and provider characteristics? This analysis illustrates the potential use of this type of data source for the broader field and how similar data sources might be improved to provide further insights.