Adolescent mental health has implications for current and future wellbeing. While a link exists between poverty and mental health, little is known about how experiencing material hardship, such as insecurity of food, housing, utilities, and medical care, throughout early childhood affects adolescent mental health. We examine the relationship between material hardship in childhood and adolescent mental health. We use Poisson regression to examine the effect of material hardship experienced at different stages of childhood on adolescent depression and anxiety outcomes at age 15. We use longitudinal data from the Fragile Families and Child Wellbeing Study (N = 3,222). We find that recently experiencing material hardship during childhood is positively and significantly associated with anxiety and depression symptoms at age 15, even when controlling for material hardship at age 15. Additionally, we find that insecurity during mid-childhood and the stress of lacking basic needs during a critical age may influence mental health in adolescence.