Schools are important in nurturing social skills and behaviours. Research consistently demonstrates that movement into/out of school (transience/mobility) disrupts positive social skill development, especially for students who frequently move. The impact of attending a highly transient school on "non-mobile" students is not as well-known. The current study explored the impact of values and life skill-based programme, Kiwi Can, on social development and the classroom climate for non-mobile children. Researchers administered surveys to students attending 15 intervention (i.e. Kiwi Can programme; n = 763) and 9 control (n = 456) schools in Aotearoa New Zealand. We examined the impact of programme participation by school transience level (high, middle, low) and length of school participation (new, experienced). The results indicate that students attending highly transient schools struggled to build social relationships, feel connected, demonstrate care and compassion to others, and behave in prosocial ways. They also felt less safe at their schools. Students participating in Kiwi Can for more than two years (experienced schools) showed fewer negative effects of transience on social development than less experienced schools. This research highlights the plight of students who are 'left behind.'