Posttraumatic growth (PTG) is the experience of positive psychological change that may occur in the aftermath of a traumatic event. Previous research has extensively examined the cognitive underpinnings of PTG, yet the role of emotion regulation (ER) in PTG has yet to be fully elucidated. The present study sought to investigate how emotion regulation choice (ERC) contributes to PTG. One hundred and sixty six participants completed an ERC task in which they chose to either distract or reappraise in response to negative pictures of varying intensities (low, medium, and high) with the goal of diminishing their negative emotional responses to the photos. Proportion of reappraisal choice was recorded for each intensity level and emotion flexibility scores were calculated across intensities. Analyses were conducted to determine if reappraisal choice proportion and emotion flexibility on the ERC task predicted PTG. Results revealed that overall higher reappraisal use predicts PTG. In addition, it was found that emotion flexibility and reappraisal choice proportion during high intensity trials also predict PTG. Findings suggest that reappraisal is a useful ER strategy for navigating the aftermath of a traumatic event and promoting PTG.