Parenting programs may mitigate adverse childhood experiences (ACEs) and promote positive childhood experiences (PCEs), yet they can be stigmatizing and difficult to access in under-resourced communities. We explored whether a trauma-informed, evidence-based parenting program (Chicago Parent Program; CPP) offered universally in public schools in high-poverty urban communities can engage and support parents who have experienced multiple ACEs. Parents participating in CPP in their child's school completed measures of their ACEs, PCEs, and perceptions of program satisfaction and impact. CPP uptake based on session attendance and group-leader ratings of parent engagement in CPP sessions were also obtained. Data were analyzed using descriptive and correlational statistics. Parents (N = 230 across 15 schools and 38 CPP groups; 82.6% mothers, 67.4% Black/African American, 52.8% with incomes < $20,000) reported improvements in parenting and child behavior. 53.5% reported four or more ACEs. On average, parents attended 75% of 12 group sessions and were highly engaged. ACEs and PCEs were negatively correlated (r = -0.44, p < 0.001) though neither was associated with program attendance, engagement, or satisfaction. A universal trauma-informed parenting program offered in public schools in high-poverty urban communities can engage parents exposed to high levels of ACEs.