Introduction
Hills before a mountain range For other uses, see Foothill (disambiguation). This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: "Foothills" – news · newspapers · books · scholar · JSTOR (September 2014) (Learn how and when to remove this message) Rocky Mountain foothills near Denver, Colorado Foothills or piedmont are geographically defined as gradual increases in elevation at the base of a mountain range, higher hill range or an upland area. They are a transition zone between plains and low relief hills and the adjacent topographically higher mountains, hills, and uplands. Frequently foothills consist of alluvial fans, coalesced alluvial fans, and dissected plateaus.