Youth Mental Health First Aid (YMHFA) teaches adults to recognize signs and symptoms of youth mental illness and intervene using a five-step action plan. While studies have examined the effects of the YMHFA on school staff, limited attention has been given to parent trainees in the school setting. The present study examined the outcomes following YMHFA for parents at school using a prepost and 2-month follow-up design. Researchers collaborated with schools to offer six free trainings at no cost to parents. A total of 107 parents participated in the research by completing the pre- and postsurveys. In addition, 64 of them also completed the 2-month follow-up survey after completing the YMHFA training. Analysis of covariances results indicated that following the YMHFA training, parents' mental health literacy, help-seeking intentions, attitudes toward help-seeking, behavioral intentions to use the Mental Health First Aid (MHFA) action plan, and confidence in MHFA skills increased significantly. Stigma decreased significantly. All significant changes were maintained at the 2-month follow-up. Participants also provided feedback and suggestions. Thematic analysis was used to identify themes related to beneficial aspects of YMHFA and ways to improve the training for parents at school. Implications for engaging parents in school to support youth mental health are discussed.