The study is devoted to different genotypes of an apple-tree (apple berry forms, sorts of rennet, semi-cultured and cultured apple) investigation on winter hardiness components in the conditions of the station of artificial climate. As objects of the re-searches 9 grades of an apple-tree of Buryat, Krasnoyarsk, Novosibirsk, Canadian and national selection grown up on experimental sites of SIPBP and the farm in Irkutsk Region, and also four Malus baccata forms growing in Irkutsk, Cheremkhovsky, Zalarinsky areas and five forms of an apple-tree berry allocated for territories of Buryatia were tak-en. As material for researches one-year branches of chosen apple-tree genotypes served. The mate-rial was stored before carrying out experiments at the temperature of -10 °C. Studying of winter har-diness of grades and forms of an apple-tree was carried out according to "The program and tech-nique of species studying of fruit, berry and nut bearing crops". By the results of researches all forms of an apple-tree berry rendered high stability on all components of winter hardiness. Winter har-diness at the level of an apple-tree berry was shown in the grade of Krasnoyarsk selection Dobrynya. From all studied grades of apple-trees-renets and apple-trees semi-cultural sorts only of a grade Lada and the Red cluster did not confirm high field winter hardiness. The grade of Canadian selection Melba showed average winter hardiness on the first, third and fourth components and low on the second component of winter hardiness. It is shown that the method of modeling of climatic con-ditions allows revealing features of resistance to winter damaging factors of separate grades and forms of the apple-trees, in field conditions which showed high winter hardiness.