Addressing the educational needs of students in math early on is critical given that early gaps in math skills widen further over the course of schooling. This study examines the effectiveness and costs of Kentucky's Math Achievement Fund—a unique state-level program that combines targeted interventions, peer-coaching, and close collaboration among teachers to improve math achievement in grades K-3. The program is found to improve not only math achievement, but also reading test scores and non-test outcomes including student attendance and disciplinary incidents. The benefits exist across students from various socioeconomic backgrounds, and they are slightly higher for racial minorities.