Studies have shown relatively high rates of emotional and behavioural problems among children living in out‐of‐home care. This study reports the prevalence of social problems at an 8‐year follow‐up for a group of children/young adults. Predictors for prevalence and change in emotional and behavioural problems at the follow‐up are examined. A prospective cohort design with 233 children who had been living in foster care was used. Forty‐eight per cent (n = 111) of those interviewed at baseline were located and interviewed at follow‐up. Mean age was 17.4 (standard deviation = 2.9) years. Mental health symptomatology was measured with Child Behaviour Checklist and Adult Self‐Report. Linear and generalized mixed model analyses were used. Changes in internalizing and externalizing problems from baseline to follow‐up was associated with gender. Boys showed more problems at a young age, whereas girls developed more problems later. Predictors for social problems at follow‐up were mental health at baseline, kinship care and care placement away from the local community.