Proficiency in speaking is one of the hallmarks of communicative competence, which is currently a key goal of many FL education curricula. The present study examined how FL-related emotions (anxiety, boredom, and enjoyment), speaking motivation, and spoken input beyond the classroom (IBC) related to young EFL learners’ speaking proficiency. One hundred and ten Grades 3–4 EFL learners from four primary schools in Hong Kong completed a questionnaire and a speaking test. Their parents/guardians also attended individual interviews. The data collected were analyzed using descriptive statistics, correlation, multiple regression, and path analysis. Overall, all three emotions were interrelated, but none was connected directly to speaking proficiency. Enjoyment had the strongest correlation with speaking motivation and proficiency, and it was predictive of proficiency only via speaking motivation (i.e., full mediation). IBC showed both significant direct and indirect predictive pathways towards proficiency. To our knowledge, this is the first study that has examined the interrelationships among the three emotions, speaking motivation, spoken IBC, and speaking proficiency holistically with young FL learners. Copyright © 2023 Elsevier Ltd. All rights reserved.