Our study reports on a field test examining the impact of the Physics through Evidence: Empowerment through Reasoning (PEER) curricular suite on high school students' conceptual physics understanding. The PEER suite holistically supports K-12 physics teachers' implementation of student-centered reform pedagogies that engage students in developing scientific principles from evidence. Components of the suite include NGSS-aligned curricular materials, targeted professional development with intentional fostering of professional communities, and assessment of multiple dimensions. Seven physics teachers field-tested PEER during the 2016-2017 school year and were compared to three physics teachers using a traditional approach. Findings indicate that PEER classes had higher pre/post gain scores in their conceptual understanding of physics than traditional classrooms. These preliminary results suggest that holistic approaches towards supporting physics education reform may be effective in facilitating shifts in students' conceptual understanding of physics.