This study examines the effect of Moodle-enhanced instruction on Jordanian EFL students' reading comprehension and grammar performance. The study uses a quasi-experimental, pre- /post-test design. A purposeful sample of 32 students, enrolled in a language requirement course at a Jordanian state university, was randomly divided into an experimental group (n = 17) and a control group (n = 15). The former used blended learning in which Moodle supplemented in-class instruction whereas the latter used in-class instruction only. Using means, standard deviations, ANCOVA and MANCOVA, the analysis revealed that the experimental group outperformed the control group (at a = 0.05) in both reading comprehension and grammar.