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This paper delineates bioclimatic zones of the Colorado Front Range. It develops a methodology which might be useful for making inventories of mountain bioclimates in other parts of the world. Following a description of the vegetation and the climate of the Front Range some insight is gained into the bioclimatic systems of the area by examining the applicability of established climatic classifications. The main part of the paper explains procedures for distinguishing the bioclimatic zones. The variables employed in determining the zones are the ratio of growing season thawing degree days to growing season precipitation, summer mean temperature, and growing season soil moisture deficit. Aspect is examined as a possible...