Summary:

This paper presents thermal conditions of grapes’ vegetation in south- -eastern Poland. Based on data from 5 stations from this area there were analyzed complex indices of the climate. There were compared periods 1971–2000 and 1991–2000. To show thermal conditions there were estimated date of beginning, ending and duration of thermal seasons. There were also estimated sum of active temperatures over 8 and 10ºC, LTI index. Significant change of climate in Poland is seen in growth of annual aver-age air temperature (specially in last two decades of XX century). A result of con-tinuous changing is that most changeable are spring and autumn. Seasons with temperature above 10ºC have a tendency to prolong and start earlier. Average dates of beginning of winter are different, it begins earlier and gets hotter. It was also noticed that dates of beginning of growing and vegetation period in 1991–2000 are different in comparing with 1971–2000. Sum of active temperatures (STA) and LTI index are higher in last ten years of XX century. These conditions could be positive aspects of climate changing. They can bring new possibilities for plants, which need higher temperatures and much sun-shine than traditional plants cultivated in climatic conditions of south-eastern Po-land. Sum of active temperatures (STA) allow growing early and very early varie-ties of grapes. It also has been noticed that solar conditions are appropriate for grape growing. All this researches show that changing of lasting all of thermal seasons may cause changing in agricultural areas. There may be opportunities for growing plants, which need light and high temperatures. The example for this may be a grape, which was use to cultivated in Poland. Not only cultivation of grapes, but production and tasting can make opportunities for farm of south-eastern Poland.