The impact of college STEM [science, technology, engineering, and mathematics] summer bridge programs is not well understood. This nationwide study pooled data from 27 colleges and universities involved in the NSF's [National Science Foundation's] STEM Talent Expansion Program to model changes in college career aspirations for 2 groups: 383 STEM summer bridge program participants and 15,464 controls. Propensity weighted modeling revealed that college STEM summer bridge programs double the odds that students plan to pursue a STEM career, compared with students without program exposure. We found this to be true across a range of demographics and student background characteristics. Implications for college educators, practitioners, and policymakers are discussed.