Using interview data with civic environmental stewardship groups in New York City ( n = 26), we identify strategies through which civic stewards engage in transboundary environmental governance and urban climate adaptation planning. Our findings articulate the diverse ways that civic stewards engage with planning in urban socio-ecological systems, as they (1) shape physical spaces, (2) broker partnerships, (3) disrupt the status quo, (4) build civic capacity, and (5) envision new futures. We contribute to the literature by embedding civic stewardship within urban planning discourse, suggesting partnerships between civic stewards and government planners that facilitate the co-production of innovative urban climate governance efforts.