Objective: In this paper, we describe an approach to engage young children in evaluating the impact of "La Vida Buena," a community health worker-led childhood obesity intervention for Latino children aged 5-8 years. Design: This paper describes the collaborative process used to pilot, refine, implement and evaluate evaluation activities, including a drawing and sorting activity, with child participants. Setting: "La Vida Buena" was implemented with Latino children aged 5-8 years and their parents or caregivers. The children were patients at a Federally Qualified Community Health Centre in a rural town on the US-Mexico Border. The intervention was implemented in a community setting. Methods: Participants were invited to participate in Guided Evaluation Activities during the 3-month and 6-month data collection points. Children participated in a drawing and sorting activity and discussion facilitated by teenage health facilitators or a community health worker. An observer took notes during the activities, and results were analysed by a university evaluator and "La Vida Buena" staff. Results: Findings demonstrated that the children understood some key messages of the class and identified important areas for improvement in the curriculum content and delivery. Conclusion: By designing evaluation methods that take the unique needs and perspectives of children into account, health promotion programmes can move beyond relying on parent-centric evaluation approaches and gain a deeper understanding of how children experience health intervention programmes.