Ecological education is the most suitable for the development of ecological consciousness of primary school children because it brings the change in the way of thinking, behaving and value system. Various activities can contribute to the development of ecological awareness of primary school children in which primary school teachers can use different ecological topics to familiarize children with ecological problems. One of such activities is celebrating environmental dates with which pupil’s attitude toward the environment and nature changes. Within this thesis, the sample was selected from two primary schools in Virovitica during May and June 2017 so the study covered 41 primary school teachers. The research was aimed at finding out whether environmental dates are celebrated in primary schools and which dates are the most represented, but also whether environmental dates are mentioned in science textbooks. The results indicate that primary school teachers celebrate environmental dates and dates which are celebrated by all respondents are World Water Day and Earth Day. Also, most respondents have never celebrated Day of Clean Mountains and World Soil Day and all of the respondents celebrate environmental dates while teaching science. In the analysed science textbooks there is very low representation of environmental dates and the most represented date in them is Thanksgiving Day for the Fruits of the Land.