In response to the interest in learner autonomy in recent years, educational research has been increasingly paying attention to students’ out-of-class autonomous learning activities. This study aims to (1) describe the extent to which Indonesian tertiary students engaged in autonomous English language learning outside the class, (2) explore their perceived constraints in practicing autonomous learning, and (3) examine whether there are any significant differences in the autonomous learning activities between female and male students and between the English major students and non-English major students. Employing the explanatory mixed-method design, a total of 402 first-year students completed a questionnaire, and 30 of whom were interviewed. The questionnaire data were analyzed using descriptive statistics and non-parametric tests, and the interview data were analyzed using thematic analysis. The results showed that the students did engage in several out-of-class English learning activities, however many of the activities were more receptive than productive. The interviews echoed the questionnaire results, and the students claimed that they were not autonomous in their learning due to several constraints. The results also revealed that there is no significant difference in the level of practice of autonomous out-of-class activities based on gender but a significant difference was found concerning majors of study. Practical implications for the Indonesian context are put forward.
