The objective of this study was to evaluate the possibility of applying thermovision as a method for measuring the temperature of crops under cover. The thermal imaging methods allowed demonstration of temperature differences between the investigated crop objects. They also enabled quick determination of the temperature gradient in plastic tunnels without a need for installation of a large number of standard temperature sensors. Moreover, the thermographic method allowed the observation of the phenomenon of convectional heat transfer from the bed of the stone accumulator into the tunnel. The results suggest that thermography is a very useful technique for recording thermal conditions of crops under cover.