This longitudinal research examined whether children's facial trustworthiness as judged by strangers can predict their real‐world trustworthiness and peer acceptance. Adults (Study 1) and children (Study 2) judged the facial trustworthiness of 8‐ to 12‐year‐old children (N = 100) solely based on their photographs. The children's classmates were asked to report their real‐world trustworthiness and peer acceptance. Children's facial trustworthiness reliably predicted these outcomes both initially when the photographs were taken, as well as 1 year later, and this effect was mediated by the initial ratings of real‐world trustworthiness and peer acceptance. These results provide evidence for a long‐lasting linkage between children's facial and real‐world trustworthiness.