This article presents the outcomes of a large‐scale program evaluation into whether the pedagogical innovation which is associated theoretically to CLIL is actually trickling down to on‐the‐ground practice. To this end, three sets of questionnaires have been applied and semi‐structured interviews have been conducted with 2,633 teachers, students, and parents in three monolingual communities in Spain in order to carry out an in‐depth analysis of where we stand in the process of implementing CLIL methodology, materials, and evaluation. A detailed diagnosis is provided and within and across‐cohort comparisons are carried out. The outcomes reveal that considerable headway has been made in the implementation of CLIL methodology, materials, and evaluation, although problems still continue to surface affecting diversity, parental support, and teacher training.