This study examines the relationship between the working conditions of student teaching schools and changes in student teachers' planned persistence in teaching. Planned persistence (and a related construct, initial commitment) is an important predictor of initial entry (Rots, Aelterman, Vlerick, & Vermeulen, 2007) and actual persistence in teaching (Chapman, 1984; Chapman & Green, 1986; Johnson & Birkeland, 2003), making planned persistence an important outcome of interest. This study quantifies the working conditions of student teaching schools in two ways: first, using surveys of more than 1,000 student teachers who student taught in one large urban district during 2 years, and second, using several years of district administrative data on in-service teacher stability in those schools. These measures of school working conditions are used to predict changes during student teaching in student teachers' planned persistence in education, teaching, and the district where they student taught. These analyses shed light on whether the broader school workplace matters to student teachers as they make plans for their future careers or whether other aspects of student teaching are more important, and have implications for the decisions student teaching programs--and school districts--make about where to place student teachers.