Cereal crops are widely spread in food industry and for that reason methods of their cultivation and storage have to be strictly controlled. They are susceptible to mold growth and some of developed mold types have the ability to produce mycotoxins dangerous for our health. Climate change directly influences environmental factors such as temperature, precipitation and carbon dioxide levels which will affect representation of molds and mycotoxins in crops. For the purpose of this experimental work, samples of wheat, maize and barley were collected form eastern, middle and northern parts of Croatia. That includes 90 samples in total collected from storage units in March 2021 with the purpose of identifying grown molds on these crops and determining their concentration. After the analysis and statistical data processing more attention was given to Penicillium, Fusarium and Aspergillus species, most common contaminants of these crops. Results have shown that the most significant mold concentration was observed in maize samples in all three Croatian regions on MEA and DRBC medium (orders of magnitude 106 and 107). Penicillium species was observed in all analysed samples while Fusarium species was particularly noted in maize samples. Aspergillus species, producer of aflatoxins, was identified most frequently in wheat and maize samples from eastern Croatian region. For adequate storage of crops it is important to ensure proper temperature, moisture and carbon dioxide level conditions in used facilities to escape high contamination levels and unwanted effects on crop yield. Along with controlled conditions in manufacturing, it is important to raise awareness about climate change, expenses it will cause in agriculture and how it will affect crops which are widely spread in our diet.