This study reports on an evaluation of the Reading Partners program, which uses community volunteers to provide one-on-one tutoring to struggling readers in underresourced elementary schools. The study showed that after one year of implementation, the program significantly boosted students' reading comprehension, fluency, and sight-word reading — three measures of reading proficiency. These impacts are equivalent to approximately one and a half to two months of additional growth in reading proficiency among the program group relative to the control group.