This study builds upon previous research examining the relationship between first-language (L1) reading, second-language (L2) knowledge, and L2 reading. The unique contributions of L1 reading, L2 vocabulary, and L2 grammatical skill to L2 reading scores are investigated along with whether or not the contributions differ by course level. Subjects included 131 students (88 beginners and 43 upper level) enrolled in French at the U.S. Air Force Academy. Data were analyzed using multiple regression. Two programs were run for each subject group because L1 reading was measured using two different tests—recall protocols and the comprehension portion of the Nelson Denny Test. All of the independent variables contributed significantly for beginners, but did so for the upper level subjects only when L1 protocols were used as the reading measure. Typically, L1 reading contributed substantially, particularly for the upper level group, supporting Cummins's (1981) Hypothesis. This study demonstrates the importance of L1 reading and L2 knowledge to L2 reading comprehension.