Annual growing season length is increasing almost everywhere in Europe, mostly in Eastern and Northern part. In Slovenia, the length of the annual growing season is increasing, especially since mid-1990s. According to projections, duration of the annual growing season throughout Europe will increase in future. This will affect the expansion of more thermally demanding plants to areas towards the north of Europe, where the cultivation of such plants has not been possible so far, and in the southern part of Europe where changed thermal conditions will allow the growing season to extend towards the winter season. In all parts of Central and South-Eastern Europe, dry and hot summers will hamper crop production.