The authors examined the results of a three-year summer intervention, Dig Into Reading, for pre-first-grade through pre-third-grade students. This partnership among university professors, public school Title I teachers, and primary classroom teachers resulted in the development of research-based, copyright-free, replicable summer reading intervention materials. The four-year study involved collecting baseline data in year 1, then implementing the program, which progressed from sending 100 bags home with struggling pre-first-grade readers in year 2 to adding 100 bags for pre-second graders in year 3 (100 pre-first-grade and 100 pre-second-grade bags) and adding pre-third graders in year 4 (100 pre-first-grade, 100 pre-second-grade, and 100 pre-third-grade bags). The results of the Dig Into Reading intervention showed that participating students retained at least 30%-67% more reading ability based on reading level than did students in the baseline group who did not participate.