Cultivating Emotional Balance (CEB), an emotion skills and mindfulness intervention, improved wellbeing in a sample of teachers. Two studies examined whether such gain is associated with improvements in classrooms. Study 1 examined post-intervention differences in 20 dimensions of classroom climate (N = 21). CEB teachers were rated higher in productivity than controls. Study 2 was a randomized, controlled pilot trial of 35 teachers with longitudinal assessments of classroom climate, wellbeing, and attitudes towards challenging students. Although the CEB group reported more mindful observing compared to the control group at follow-up, the groups did not differ on classroom climate or attitudes. (Contains 6 tables and 1 figure.)