DREAMzone is an educational intervention designed to increase higher education professionals' competency and self-efficacy for working with undocumented students. Grounded in social learning theory, we developed the DREAMer-ally instrument to investigate the effects of DREAMzone on DREAMer-ally competency and self-efficacy. Findings support the notion that DREAMzone positively improves participants' DREAMer-ally competency and self-efficacy. This study serves as one of the first to provide evidence supporting educational interventions aimed at improving undocumented students' higher education experiences.