Objective: ED utilization has increased disproportionately for pediatric psychiatric care. This study aimed to identify predictors of emergency department (ED) utilization within 30 days after discharge from a pediatric psychiatric hospitalization. Methods: ED utilization was assessed in the 30 days after discharge. Univariate logistic regression modeling identified predictors of ED utilization, which were used in subsequent multivariate modeling. Results: Greater number of trauma types (OR=1.92, CI=1.50-2.45, z=2.67, p=0.008), generalized anxiety disorder (OR=3.20, CI=1.78-5.76, z=1.98, p=0.048), and longer length of stay (OR=1.05, CI=1.03-1.07, z=2.74, p=0.006) were associated with increased ED utilization within 30 days of discharge. Discussion: ED utilization may be an important marker of negative outcomes within 30 days of discharge from pediatric psychiatric hospitalization. Patients with high trauma exposure, anxiety and acuity marked by increased LOS may require additional services to prevent unplanned ED utilization for psychiatric crises.