The article presents the results of studying the influence of polypropylene covering materials of red, blue, white color with 60 g / m2 UV on stability of the strawberry plants to adverse environmental stressors of autumn-winter and spring periods, and formation of a highly promising seedlings of 13 varieties in mother plantations. Using polypropylene covering material  of white, blue and red colors provided high winter hardiness, good general condition (score of 4-5) of strawberry plants and high yield of seedlings. We identify the trends for higher level of air and soil heating under blue polypropylene in early spring and under red one in autumn.