This study was conducted with the aim of recognizing and classifying those structural criteria in the traditional houses of Ardabil which were effectively compatible with the climate of the region. To this end, a combination of both quantitative and qualitative research methods was used. Based on the frequency percentages of indices in the samples under investigation, the structural criteria compatible with the climate of the region were close to each other. They were generally classified in 5 classes, wherein the indices of outer space, inner spaces, and spatial details were of paramount importance.