Hard ticks are obligate, hematophagous ectoparasites which can transmit pathogens that cause infectious diseases (viruses, bacteria, protozoa and helmintes) in animals and humans. It is known that only certain species of hard ticks are vectors for certain causative agents and their distribution is different depending on geographic location and season of the year. Aim of this research was to determine how are prevelence and abundance of some hard tick species in Karlovac county changing in regards to month of the year and search area. This information gives an insight of which areas are the ones with higher possibility of contracting a tick-born diseases. The results are shown for species I. ricinus, D. reticulatus and H. punctata. Ticks are collected from the enviroment and species and life stages were determined using drawings and photographs. Ticks were collected from the enviroment and, developmental stages and species were determined using the existing determination keys. The results of the identification were shown with their original drawings and photographs while prevalence was shown using descriptive statistics. The species I. ricinus, D. reticulatus and H. punctata were collected. I. ricinus, collected in Karlovac county area, was the most abundant among collected samples with prevalence of 84,52% (142/168). During the research, D. reticulatus ticks were found only in the northeast part of the county with total prevalence of 8.92% (15/168) while H. punctata was found only in the southern part of the county making the overall prevalence of 6.54% (11/168). Based on the obtained results, considering the abundance and distribution in Karlovac county area, the I. ricinus represents te highest risk factor in transmiting certain contagious diseases on animals and humans. However, the vectoral capacity of D. reticulatus northeast and H. punctata in the south should be also taken into consideration.