Evaluating the Sandy Hook Promise Foundation’s Know the Signs Program in Preventing School Violence in the Los Angeles Unified School District

School violence is a widespread public health issue affecting youth in the U.S. To help address this problem, we examined the effectiveness of the Sandy Hook Promise Foundation's <i>Know the Signs</i> program on positive school climate indicators and youth developmental outcomes in the Los Angeles Unified School District. We found that students who attended <i>Know the Signs</i>, a school-based violence prevention program, reported greater school climate indicators post-programming when compared to their baseline scores. Further, we found that students who attended <i>Know the Signs</i> reported more positive school climate indicators, including school connectedness and community perceptions, than non-attendees. These findings provide additional nuance to existing evidence that a positive school climate can be one strategy to prevent violence and improve safety while promoting positive youth development in schools.