The present paper is based on data from an ongoing research project aiming to investigate possible effects of extramural English (EE) on oral proficiency (OP) and vocabulary in ESL. EE can be described as linguistic activities that students do or are involved in outside the classroom in their spare time. The study is based on speech data collected from Swedish 9th grade ESL students (N=80) in four school classes on five occasions during one school year. Speech was elicited using five interactional speaking tests, and students were assigned to random dyads on each occasion. The students were assessed qualitatively by three raters and a total of 1,140 assessments were made. In addition to the speech and rater assessment material, questionnaire data (background questionnaire and language diaries) of students EE were collected. To answer the main research question, if EE has an effect on OP and vocabulary, statistical software is used. However, a quantitative method of analysis cannot make any claims regarding causality or the direction of causality between variables; nevertheless, it can point to relationships between variables. My study shows a significant positive correlation between students total time spent on EE and their mean OP grade (.307**, Spearman, 2-tailed). Likewise, there is a significant and positive correlation between EE and students vocabulary skills (.357**, Spearman, 2-tailed). Other research questions address the relative importance of different EE activities for students OP and vocabulary skills. I will address those results in my paper. Finally, I will address the results of correlation analyses between EE and OP/vocabulary with regard to gender and with regard to less proficient learners