Supporting teachers' implementations of technology in the classroom is a critical and longstanding issue in mathematics education. As access to various technology resources grows, a need exists for professional development opportunities that prepare teachers to integrate technology effectively to support students' mathematical learning opportunities. Virtual manipulatives (VMs) are one technology tool receiving increased attention. Despite the benefits to student learning, secondary mathematics teachers use VMs less frequently than elementary teachers. Therefore, this study investigated a professional development opportunity aimed at supporting middle and high school mathematics teachers' implementation of VMs. Findings indicate two tools (a repository of resources and a task analysis framework) supported teachers as they prepared to implement VMs and tasks. Additionally, teachers were further supported via time for active learning (teachers interacting with VMs related to their upcoming instructional units) and collaborative planning.