To understand the conditions fostering positive outcomes of inclusive schooling, this two‐wave study examined the role of individual change in trust and sympathy for adolescents' cross‐group friendships and inclusive attitudes toward students with low academic achievement. Cross‐group friendships, intergroup trust, intergroup sympathy, and inclusive attitudes were obtained from surveys completed by 1,122 Swiss adolescents (Mage T1 = 11.54 years, Mage T2 = 12.58 years) from 61 school classes. Results from a parallel latent change score model revealed that the number of cross‐group friendships positively related to individual change in trust and sympathy; this growing trust and sympathy in turn predicted adolescents' inclusive attitudes. These findings are discussed regarding theories of intergroup contact and inclusive schooling.