As an important aspect of teacher expertise, noticing skills need to be learned and practiced in teacher education programs. Although noticing literature has reported on the effectiveness of videos with associated scaffolding structures and the significant role that practical experiences play in teachers’ development of noticing skills, research on ways to support prospective teachers’ noticing in both video-based and authentic classroom settings in the field of science education is scarce. Building on teacher noticing research and the critical incident framework, this article describes a model that engages a group of prospective elementary teachers in the practice of noticing first in a 2-week, online, video-based training module and then in dynamic and complex classrooms when they attend a practicum associated with a science methods course. Detailed descriptions of the model, prospective teachers’ learning outcomes, and thoughts and considerations for implementing the model are shared. Differences between prospective teachers’ noticing journal entries prior to the video-based training module and immediately after, along with their noticing patterns in the practicum classrooms, show the development of prospective teachers’ noticing skills during the semester. Factors that were found to impact prospective teachers’ noticing in video-based and authentic classroom settings include: (a) using the adapted critical incident framework as a scaffolding guideline, (b) providing continuous feedback on prospective teacher noticing journals, and (c) having opportunities to observe science instruction in practicum classrooms.