During the three-year studies, effects of a natural pattern of spring temperatures on the possibilities of achieving full vernalization of stecklings and good quality and quantity yields of celery seeds were evaluated. The object of the research was celery of cultivar ‘Utah 52-70’. Seeds were sown in four different terms: 1st June, 1st July, 1st August and 1st September. The plants grew in a greenhouse till spring. It was shown that the arrangement of natural temperatures in the field in April and May allowed full vernalization of stecklings. The optimum time of sowing seeds for stecklings was between the 1st June and the 1st July. All the stecklings of that term had high yields of good quality seeds, on the average from 18.8 to 19.5 kg/100 m². A lower yield and worse quality seeds were observed in the case of plants from the later time of sowing. Natural spring colds were not sufficient for the full vernalization of ‘younger’ stecklings, which resulted in disturbances in their development, blooming and their seed setting. Changes in the climatic factors of the experimental years had significant and modifying effects on the height and the quality of seed yields.