In a sample with known levels of preshooting posttraumatic stress (PTS) symptoms, we examined the impact of a campus mass shooting on trajectories of PTS in the 31 months following the shooting using latent growth mixture modeling. Female students completed 7 waves of a longitudinal study (sample sizes ranged from 812 to 559). We identified 4 distinct trajectories (n = 660): (a) minimal impact‐resilience (60.9%), (b) high impact‐recovery (29.1%), (c) moderate impact‐moderate symptoms (8.2%), and (d) chronic dysfunction (1.8%). Individuals in each trajectory class remained at or returned to preshooting levels of PTS approximately 6 months postshooting. The minimal impact‐resilience class reported less prior trauma exposure (η2 = .13), less shooting exposure (η2 = .07), and greater emotion regulation skills than all other classes (η2 > .30). The chronic dysfunction class endorsed higher rates of experiential avoidance prior to the shooting than the minimal‐impact resilient and high impact‐recovery classes (η2 = .15), as well as greater shooting exposure than the high impact‐recovery class (η2 = .07). Findings suggest that preshooting functioning and emotion regulation distinguish between those who experience prolonged distress following mass violence and those who gradually recover.