Cultural heritage is undoubtedly the bearer of the identity, history and culture of a nation, and its protection is a precondition of social and cultural development. Immaterial heritage does not imply just customs, but also crafts, the language as a means of understanding each other and transferred from generation to generation, dance and other. This paper elaborates the traditional annual customs celebrated in Istria. A survey of the traditional heritage of Istria is given through the description of single customs, which is the basis to get the insight the celebration of annual holidays, not only in a broader territory of Istria, but also within single families in the same territory. More detailed description, in chronological order, are given of the following holidays: Advent, Christmas Eve, Christmas, New Year, Epiphany, Carnival, Candlemas, Easter, Corpus Christi, St. John the Baptist’s Day, Assumption of the Virgin Mary, All Saints’ Day and St. Martin’s Day. Customs changed, some ceased to be celebrated, however the majority of the customs described have been preserved and adapted to today’s way of living. Various cultural manifestations and folklorization of which a main share is in function of tourism, contribute to the survival, thus strengthening collective consciousness and valorising our traditional culture.