The association between chronic exposure to adverse childhood experiences (ACEs) and poor behavioral health outcomes across the lifespan is well-established, but ACEs are preventable. This recorded webinar, hosted by the Pacific Southwest PTTC, will explore the evidence supporting upstream strategies that can prevent ACEs from happening in the first place as well as positive childhood experiences (PCEs) that can mitigate the harms of ACEs. Recent data sources that can be used to monitor ACEs and PCEs at the state-level to guide prevention and evaluation activities will also be explored.