What landform causes parts of the US to have a highland climate?

The Rocky Mountains are the primary landform responsible for creating highland climates in parts of the United States. Their elevation and topographical features lead to cooler temperatures and varied precipitation levels, which characterize highland climates. Additionally, the mountains influence weather patterns, causing orographic lift that can result in increased rainfall on the windward side and drier conditions on the leeward side. This variation in climate is particularly evident in regions like Colorado and parts of the western U.S.