This study examines the impacts of two AmeriCorps programs, Minnesota Reading Corps and Wisconsin Reading Corps, where AmeriCorps volunteers provide literacy tutoring to at-risk kindergarten through third-grade (K-3) students utilizing a response-to-intervention framework. This evaluation replicates a prior randomized controlled trial evaluation of the program 4 years later and for the first time evaluates the program model replicated in Milwaukee, Wisconsin. The results of the two evaluations showed that kindergarten and first-grade students who received a single semester of Reading Corps tutoring achieved significantly higher literacy assessment scores, and demonstrated meaningful and significant effects after a full-school year of the intervention for second- and third-grade students.