This brief studies an intervention that placed mental health clinicians in Minnesota schools. This analysis focuses on the implementation of the school-based mental health (SBMH) program in K-12 public schools in Hennepin County, Minnesota, which includes the city of Minneapolis and its suburbs. The analysis uses administrative data and survey data on nearly 500,000 students, together with new data collected on the implementation of the program from 2001 to 2019. The SBMH program increased students' access to mental health services by 8 percent and decreased rates of attempted suicide by 15 percent, averting approximately 260 self-reported suicide attempts a year by 2018. With a program cost of about $117 per pupil annually, the results suggest that SBMH could be a valuable investment in child and adolescent mental health.