We investigated environmental supports, an understudied aspect of Social Cognitive Career Theory (SCCT), with rural Appalachian youth, an understudied population. We developed a new measure of proximal influences that bolster the pursuit of postsecondary education, the Assessment of Postsecondary Supports (APSS). Across 3 studies, we develop and validate the new measure, finding strong internal consistency and construct validity. Moreover, scores on the APSS were positively correlated with college-going self-efficacy (CGSE) and college outcome expectations (COE), explaining more unique variance than a measure of perceived educational barriers.