The paper indicates the importance of dialects in the speech of preschool children from the area of the Koprivnica-Križevci County in which is specifically spoken the Kajkavian dialect and its local dialects which are in contrary from the Croatian standard language. The process of stokavisation and standardisation has also affected this part of Croatia, which is why it is desirable to develop dialect of this region early in age. The talk of preschool children is influenced by change because many feel that it is the only right to use the standard language and that other dialect are not accurate and confidential. A family is a community where a child first learns and develops his language, and then an important part takes the educator or a teacher who, along with children through an enabling environment, should cultivate and develop native speech of children with all the dialects so that the particularities of this speaking area would not be forgotten. The Kajkavian dialect plays an important role in the history of the Croatian language which is confirmed by important works that were written in this dialect, but today, sadly, we rarely find literature written in Kajkavian dialect during the educational process of children and students. Reflecting the voice skills of children in a satisfying and secure environment without neglecting the child's first talk by parents and educators, the child adopts the peculiarities of the dialectic which will enable the mastery of the standard language and dialect. The paper explains the specifics, the lexicon, and also the research of frequent use of the dialects in the speech of preschool children and only a recognition of Kajkavian dialects from this speaking area. It also points to the importance of cultivating local speech, culture and tradition in order to keep this part of cultural heritage so that it wouldn’t disappear with the disappearance of the elderly population. Thanks to the test,the data needed to demonstrate the frequency of using the dialects as well as their identification is collected. The sample consists of 100 respondents,preschool children ranging between 3 and 7 years from the Koprivnica-Križevci County. According to the results of the study,children do not recognise a large number of dialects regardless of whether they come from the rural or urban part of the Koprivnica-Križevci County. Also,they recognize and name the dialectics of the region they come from to a greater extent than they use them in verbal expression.