Physical classroom environments for young children and the quality of those environments have typically been studied by utilizing various rating scales. Research is limited on early childhood educators’ perspectives and decision-making processes in striving to create optimal physical classroom environments during the school year. This qualitative study used the theoretical lens of Bronfenbrenner’s microsystem to examine 22 prekindergarten lead teachers’ decision-making processes regarding initial set up of physical classroom environments, their ability to modify and update their classroom during the school year, and the barriers they face in providing optimal learning environments. Findings indicated that prekindergarten teachers dedicate most of their time, attention, and resources to physical classroom environments at the start of the school year. Great variations were found in the amount of autonomy the teachers had in set-up and materials selection. Updating and modifying those physical classroom environments also varied greatly depending on school setting and teacher experience. The main barriers revolved around budgets, physical space, and time. Implications for child care quality are discussed. (author abstract)