The COVID-19 pandemic and public health response to contain the spread of the virus had many unintended consequences, impacting virtually all aspects of young people’s lives; including social, academic and recreational activities in addition to economic and employment opportunities. Researchers were interested in children, adolescents and young adults who were vulnerable to these disruptions and may have experienced additional mental health challenges. The study compared rates of use for in- and out-patient mental health services during the pandemic to pre-pandemic rates for this population. This presentation will outline our findings from a recent study in Ontario, Canada comparing service utilization rates for in- and out-patient mental health services during the pandemic. Results and findings will be used to generate discussion around epidemiological surveillance of mental health in children and youth.