Extended Learning Opportunities Summer Adventures in Learning (ELO SAIL) is a Montgomery County Public Schools summer program for students in all Title I elementary schools; it targets students who will be in kindergarten-Grade 2 in the fall following the program. This report analyzed demographic characteristics of attendees and the impact of the program on academic performance of participants, compared to non-participants. The report concluded that the positive impact of ELO SAIL was stronger on academic performance in the fall than on performance at the end of the year, based on statistically significant differences between attendees and non-attendees. Consistent with previous evaluations of ELO SAIL, the benefits varied by content area, with more positive findings in mathematics than in reading, and varied by grade level, such that positive findings in reading mainly were for kindergarteners, while positive findings in mathematics were limited mainly to first and second graders. However, in this study, unlike previous ones, a benefit for an entire grade level usually was evident for the majority of student subgroups. Appended are: (1) Findings for Question 2 on Fall Performance: Reading for Subgroups of Kindergarten Students;(2) Findings for Question 2 on Fall Performance: Mathematics for Subgroups of Kindergarten Students; (3) Findings for Question 2 on Fall Performance: Reading for Subgroups of Grade 1 Students; (4) Findings for Question 2 on Fall Performance: Mathematics for Subgroups of Grade 1 Students; (5) Findings for Question 2 on Fall Performance: Reading for Subgroups of Grade 2 Students; (6) Findings for Question 2 on Fall Performance: Mathematics for Subgroups of Grade 2 Students; (7) Findings for Question 3 on End-of-Year Performance: Reading for Subgroups of Kindergarten Students; (8) Findings for Question 3 on End-of-Year Performance: Reading for Subgroups of Grade 1 Students; (9) Findings for Question 3 on End-of-Year Performance: Reading for Subgroups of Grade 2 Students; (10) Findings for Question 3 on End-of-Year Performance: Mathematics for Subgroups of Kindergarten Students; (11) Findings for Question 3 on End-of-Year Performance: Mathematics for Subgroups of Grade 1 Students; and (12) Findings for Question 3 on End-of-Year Performance: Mathematics for Subgroups of Grade 2 Students.