This study explores the challenges and successes that two public school teachers experienced while implementing youth participatory action research (YPAR) with their students in core academic classrooms. Most academic studies of YPAR have focused on university-based researchers implementing YPAR with youth outside school settings or in special courses inside schools such as electives. Hence, the findings of existing research may not adequately predict the experiences of teachers implementing YPAR within the constraints and requirements of core academic classrooms. Using action research and ethnographic approaches including interviews, field notes, teaching artifacts from classroom observations, and reflective conversations with teachers, I found that the two teachers successfully implemented the epistemological tenets of YPAR in many ways and achieved positive outcomes. However, they were also stymied by structural issues common to core academic classrooms, such as required curricula, standardized testing, and large class sizes.