This study investigated the role of after-action reviews on perceptions of safety climate at the group and organizational levels. Moderated and mediated regression analyses of data from 67 firefighting crews suggest that after-action review frequency positively influenced both levels of safety climate. Safety-oriented group norms fully mediated the relationship between after-action review frequency and group-level safety climate. Fire-station busyness moderated the relationship between after-action review frequency and organizational-level safety climate, such that the relationship was non-existent for highly busy stations. These findings suggest that after-action reviews constitute a specific venue through which managers can promote safety climate in high-risk environments.