School-based mental health services are a promising context for evidence-based interventions to promote early socio-emotional development, yet implementation presents significant challenges. This paper describes the rationale, content and format of a school-based intervention, Starting Strong in Kindergarten (Starting Strong). Starting Strong is a 10 week, indicated prevention programme aimed at promoting positive student-teacher relationships and behavioural adjustment during the transition to kindergarten. This parent- and teacher-focused indicated prevention programme targets children with or at risk for disruptive behaviour problems. The paper describes feasibility results of a pilot study of Starting Strong's parent programme. Twenty-five families participated; rates of enrolment, attendance, retention, session engagement, homework completion, treatment fidelity and participant satisfaction suggest promising feasibility. School-based efforts targeting the transition to kindergarten may be helpful in improving behavioural and relational adjustment, especially for children who begin school with behavioural or relational risk.