Educators and school staff are critical to recognizing and supporting students' mental health, but frequently do not have the training to confidently bring mental health literacy into the classroom or assist students who experience distress. Moreover, few free, easily accessible trainings are available for this audience. Classroom Well-being Information and Strategies for Educators (Classroom WISE) is a free, K-12 mental health literacy training package that includes a self-paced online course, video library, and resource collection. Using pre- and postcourse anonymous surveys from over 2000 educators, school mental health professionals, and school staff who completed Classroom WISE, this study found high levels of satisfaction, significant increases in mental health literacy knowledge, high perceived importance of mastering skills to promote student well-being, and increased preparedness to implement mental health-related strategies. Participants reported intentions to bring mental health literacy into the classroom, and identified barriers and facilitators to using Classroom WISE that leaders can respond to or employ when moving to implement Classroom WISE across a school or district. School district or school-wide use of Classroom WISE can assist in building a safe and supportive school environment and help students in need to access mental health services.