To examine state-level variation in mental health screening practices for high school athletes in the USA and evaluate associations between screening protocols and adolescent depression-related and suicide-related outcomes.

Cross-sectional study of preparticipation examination (PPE) forms and Youth Risk Behaviour Surveillance System (YRBSS) data.

High school athletics across all 50 US states and the District of Columbia.

732 676 high school students who completed the 2021 YRBSS survey (grades 9–12).

Prevalence of depressive symptoms and suicide-related behaviours, measured using YRBSS items on sadness/hopelessness, suicide ideation, planning, attempts and suicide attempts resulting in injury. State-level PPE forms were reviewed for presence and depth of mental health screening, including Patient Health Questionnaire-4 (PHQ-4) and eating disorder (ED) risk questions.

Screening practices varied widely, ranging from no mention of mental health in some states to required evaluations with formal referral protocols in others. Of 732 676 students, 503 861 (68.7%) reported feeling sad or hopeless, 608 416 (83.0%) seriously considered suicide and 64 072 (8.8%) attempted suicide in the past year. States with required screening protocols had higher reported rates of depressive symptoms (71.0% vs 68.7%, p

High school athletes represent a vulnerable group in need of structured and standardised mental health screening. State-level screening policies were associated with lower suicide attempt rates, though causal inference is limited by the cross-sectional design. Standardised use of validated mental health tools may support early identification and intervention for at-risk adolescents.