This study examined the occurrence and quality of educational dialogue in the preschool classrooms of teachers with low, moderate and high stress levels. Video-recordings of 21 preschool teachers were analysed based on episodes of educational dialogue and categorised with respect to patterns of dialogic teaching and shared knowledge building. The teachers' level of stress was determined based on their self-reporting of work-related stress and well-being. The findings showed that moderately stressed teachers conducted educational dialogue the most, whereas teachers with low stress conducted dialogue the least. Patterns of teacher-initiated dialogue of a high quality and patterns involving factual knowledge sharing prevailed in the sample. The study contributes to knowledge on teacher stress levels and the occurrence of educational dialogue in preschool.