The COVID-19 pandemic has affected millions of people, and some researchers postulate that a mental health crisis will follow. The immediate effects of the COVID-19 pandemic on children’s mental health are now starting to be published, and results appear to be mixed. There is no research, to the authors’ knowledge, that empirically examines the functioning of young people following intervention from Child and Adolescent Mental Health Services (CAMHS) Crisis Teams in the UK during the COVID-19 pandemic. This service evaluation aims to do this using data from an NHS trust that supports 1.4 million people in the North East of England. We compared functioning, as measured by the Outcome Rating Scale (ORS), before and after treatment for young people discharged from the CAMHS Crisis Team between December 2019 and December 2020. ORS scores were significantly higher at the end of treatment (t(420) = −57.36, p < 0.001) with a large effect size (d = −1.56). Fifty eight percent of patients exhibited significant and reliable change (i.e. functioning improved to a ‘healthy’ level). No patients significantly deteriorated in functioning after accessing the crisis service.