The purpose of this study was to evaluate the impact of the Gaining Early Awareness and Readiness for Undergraduate Program (GEAR UP) on college readiness outcomes using a quasi-experimental design. GEAR UP is designed to increase the number of low-income students who are prepared to enter and succeed in postsecondary education by providing 6-year grants to states and district partnerships to provide services at high-poverty middle and high schools. Specifically, this study sought to evaluate whether 173 schools that participated in GEAR UP showed increases in the percentages of students who were prepared to enter and succeed in postsecondary education, as compared to students from similar, non-GEAR UP schools. Seven years (2003-2009) of matched cohort data were compiled to include all regular (e.g., nonspecial education) high schools with grade 12 enrollment as documented by the National Center for Educational Statistics. Participation in and performance on three College Board assessments that measure college readiness at the high school level (SAT, PSAT/NMSQT, and AP) as well as percent free/reduced-price lunch were used to identify comparable schools. Results showed that, overall, the GEAR UP program showed positive evidence of improving college readiness outcomes for low income students using a variety of college readiness measures. (Contains 1 figure and 15 tables.)