In the study, average winter triticale grain yield data gathered at 50 COBORU experimental stations throughout Poland in the years 1982-1996 were used as well as the meteoro-logical data obtained from 57 IMGW (Institute of Meteorology and Water Management) meteoro-logical stations, recorded in the following monthly forms in the years 1971-2000: real sunshine totals (h), average, maximum and minimum air temperature (toC), average relative air humidity taken at 1 p.m. (percentage), and precipitation totals (mm). It was observed that good yields of winter triticale grain were more endangered by low temperature of air occurring from December to March, by high level of precipitation in October, and by high air temperature in May. As far as the cultivation of winter triticale in wheat soils is concerned, climatic conditions are of no danger nearly throughout the whole country. In the case of rye soils, the zone of very small risk amounts to about 40% of the area of Poland, mainly in the western and central parts of the country. The zone of small risk amounts to about 35% of the area of Poland, mainly in the south west of Poland and in Pojezierze Pomorskie (Pomeranian Lake Region) and in the south western part of Pojezierze Mazurskie (Masurian Lake Region); the zone of medium risk – 20% of the area of the country, mainly in the northern part of Pomerania; the zone of great risk – about 5% of the territory of Poland in the north western part of the country.