<p>The current study was designed to assess for associations between self-report mental health disorder symptom change scores and the frequency of monthly mental health self-monitoring surveys, amongst Royal Canadian Mounted Police (RCMP) cadets during training (i.e., starting the Cadet Training Program [CTP] to pre-deployment). Participants were RCMP cadets (<i>n</i> = 355). Multiple linear regression models were conducted to assess relationships between mental health disorder symptom change scores and the frequency of monthly self-monitoring during the CTP, adjusting for sociodemographic variables and pre-training mental health disorder symptom scores. The frequency of monthly self-monitoring was statistically significantly inversely associated with changes in mental health disorder symptoms during the CTP (<i>R</i>² = .13 to .47), meaning more frequent monthly self-report monitoring was related to decreases in symptoms. Regular mental health self-monitoring may help to directly mitigate mental health challenges among RCMP through increased self-awareness, and by facilitating proactive self-care and earlier access to evidence-based care. Trial registration: Pre-registration with aspredicted.org for the RCMP Study and associated hypotheses occurred on 7 November 2019 with the name, “Risk and resiliency factors in the RCMP: A prospective investigation” (#30654).</p>