A cross-sectional design was used to inquire about peer relations of 85 second and fifth grade students in two integrated Anglophone and Francophone schools in Montreal, Canada. Data on same- and cross-ethnic identification, interactive companions and mutual best friends were collected for each student. Overall findings were that students had more companions from their own than the other ethno-linguistic group, but equivalent numbers of mutual best friends. Same- and cross-ethnic mutual friends were rated similarly in terms of friendship quality (as assessed by the McGill Friendship Questionnaire). Exploratory in-depth interviews with 16 students indicated that cross-ethnic relationships ran into two barriers. One was that they were limited to only a few activities and locations and so did not become personalized. The second was that in-group and out-group friends did not always mix well. (Contains 4 tables.)