The gorge transitions between temperate rainforest to dry grasslands in only , hosting a dramatic change in scenery while driving along Interstate 84. In the western, temperate rainforest areas, forests are marked by bigleaf maples, Douglas fir, and western hemlock, all covered in epiphytes. In the transition zone (between Hood River and The Dalles), vegetation turns to Oregon white oak, ponderosa pine, and cottonwood. At the eastern end, the forests make way for expansive grasslands, with occasional pockets of lodgepole and ponderosa pine.