A growing body of literature indicates that childhood emotion regulation predicts later success with peers, yet little is known about the processes through which this association occurs. The current study examined mechanisms through which emotion regulation was associated with later peer acceptance and peer rejection, controlling for earlier acceptance and rejection. Data included mother, teacher, and peer reports on 338 children (55% girls, 68% European American) at ages 7 and 10. A path analysis was conducted to test the indirect effects of emotion regulation at age 7 on peer acceptance and peer rejection at age 10 via positive social behaviors of cooperation and leadership, and negative social behaviors of indirect and direct aggression. Results indicated numerous significant indirect pathways. Taken together, findings suggest cooperation, leadership, and direct and indirect aggression are all mechanisms by which earlier emotion regulation contributes to later peer status during childhood.