In this study in which case study -- one of the qualitative research methods -- was used, it was aimed to assess the effects of coronavirus disease (COVID-19) pandemic on preschool education by teachers. Preschool teachers working in 14 provinces where the number of cases is high form the universe of the study. Sample group is 140 teachers in total. So as to get data for the study, survey questions prepared by the researcher and submitted to expert opinion and structured interview forms were used. The findings of the study are as follows: preschool children had feelings of anxiety, fear and longing all together during this process and they wanted to return to their schools as soon as possible. Similarly, most of the teachers were highly concerned and worried. The teachers attended online educations related to their professional development during the process of staying home. Before COVID-19 came to Turkey, the schools did not take any measures; then, when distance education started, all schools were disinfected, the materials and toys in the classrooms were put aside after disinfection. Distance education process was quite difficult in preschool education; all the teachers taught in line with their own initiatives. During this process, while the activities most preferred by the teachers were games and art activities, the activities having pandemic theme were experiments and dramas about hygiene. Distance education increased parent participation to preschool education and this had a positive effect on parent-child interaction. In the distance education process, by establishing platforms intended for preschools, suggestions to make more and professional activities, to have common actions in cooperation with schools and to train parents were made.