This study examined preservice secondary science teachers’ perceptions of the classroom learning environment as experienced during their practicum. The study also compared this classroom learning environment to their espoused views of an ideal science classroom. The qualitative findings are corroborated by some of the results from the CLES scales, suggesting that preservice teachers perceived their practicum classrooms to incorporate only a few of the constructivist learning environment factors. Furthermore, most preservice teachers also believed that their practicum should be a flexible apprenticeship, where science teaching innovation was supported.