This research explores whether readiness to leave care mediates the association between social support – from peers, staff and biological parents – on the verge of leaving care and life satisfaction a year after among young people ageing out of care in Israel. The results represent two waves of a longitudinal study. Two hundred seventy‐two adolescents from residential settings in Israel completed a self‐administered questionnaire shortly before they left care, and one year later, 234 of them were interviewed to assess their life satisfaction. Readiness to leave care was found to mediate the relationship between most social support measurements and life satisfaction. At the same time, the findings also suggest that this mediating effect varies for different types of support and has a lesser amount of influence for profound emotional support than other types of support. These findings highlight the need to include both the preparation to leave care and the reinforcement of emotional support available to young people who aged out of care, before and throughout the transition from care to adulthood.