Communities across the U.S. and globally confront the challenge of transforming negative social determinants of health (SDOH) into positive ones. To address this complex social problem, the collective impact (CI) approach has promise but has been critiqued for insufficiently challenging structural inequities. Research applying CI to SDOH is limited. This mixed-methods study examined early adoption of CI in the 100% New Mexico initiative that aims to address SDOH population-wide in a state with strong cultural identity and assets but also persistent socio-economic inequality.