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This secondary analysis examined the association between preexisting mental health conditions and clinical recovery trajectories in adolescents with concussion. Adolescents (13-17; n = 1238) completed clinical assessments (Post-Concussion Symptom Inventory [PCSI] =48 hours postinjury; PCSI/ Pediatric Quality of Life [PedsQL] for 3 months) and were categorized into control, anxiety, depression, or combined anxiety/depression groups. Acute outcomes were analyzed using analysis of variance or ?², whereas linear and logistic regression analyzed recovery trajectories. A main effect of group was present for acute symptom scores (P = .03), but post-hoc testing revealed no significant comparisons. Main effects of group and time were observed for PCSI and PedsQL outcomes (P < .007), but interaction effects were nonsignificant. The combined anxiety/depression group reported more symptoms, worse quality of life, and had greater odds of experiencing persistent postconcussion symptoms (defined as =3 new/worse symptoms at 4 weeks; OR = 2.31, 95% CI = 1.18-4.67, P = .02) in univariate models. However, multivariable models found no association between preexisting mental health conditions and the presence of PPCS (P = .62). Preexisting mental health conditions were associated with similar longitudinal trajectories but higher symptom and lower quality of life scores overall, highlighting their importance in adolescent concussion management.