The objective of the paper was to determine the impact of conditions and storage period of beetroots on their firmness. It is a significant assessment parameter of vegetables quality. The research showed how storing time of Red ball beetroot in a cellar or a freezer influences this parameter. The research covered measurement of the maximum power obtained in the compression test of cylinder and cube shaped samples. They were carried out soon after cropping and in the period of 4-months storing in a three-weeks cycle. Analysis of the obtained results showed uniformity of groups, which proved variability of beetroots quality along with passing time. Analysis of regression allowed obtaining the function of the highest adjustment of the research results to a theoretical model.