This article presents a year-long, multisited study in which children were recruited from three coastal communities--Boston, San Diego, and Toronto--to establish the Coastal Climate Kids Collective. Guided by a critical literacies orientation with an eye toward child-centered approaches to teaching and learning, the research team collaboratively developed a series of kits that included hands-on inquiry activities and a print-based guidebook aligned to each season. Readers are offered illustrative snapshots of children's creative outputs across two findings, showcasing the potential of Coastal Calls to Action for amplifying children's climate experiences.