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Much of the northern interior Yukon was never-glaciated during the Quaternary. It has experienced cold and arid conditions for several millions of years. It represents one of the closest approximations that exist today of a periglacial landscape and provides an opportunity to assess conceptual models of periglacial landscape evolution. The terrain of two upland areas, Eagle Plain and the Barn Mountains foothills, casts doubt upon the widely-assumed rapidity of periglacial landscape modification and suggests that the complete footprint of periglaciation is rarely achieved in upland terrain. Copyright (c) 2015 John Wiley & Sons, Ltd.