A context-sensitive approach to SLA research acknowledges the interrelatedness of linguistic development and situational/cultural context. Over the years, many studies looked into the formal context of early English language learning (EELL) but the informal realms of learner experience are still largely unknown. Hence, context matters related to out-of-school availability of English and its relevance for EFL classrooms are in focus of this contribution. Sources of informal contact and linguistic gains arising from young learners’ informal experiences with English are believed to contribute to heterogeneity found in English language learning outcomes, and to point at important interactions between local learning context, age and early formal instruction. Sources of out-of-school contact with English and a corpus of self-reported informally acquired English vocabulary by learners aged 8.5–10.5 are presented. Additionally, the influence of gender as a background variable was explored. Findings are discussed against a growing awareness of heterogeneity embedded in sociocultural contexts of early EFL instruction. Finally, challenges faced by teachers of young learners and researchers of early English language development are addressed along with pedagogical implications of the study outcomes.