Oregon should be here. Wikipedia: "Mount Hood is host to 12 named glaciers or snow fields, the most visited of which is Palmer Glacier, partially within the Timberline Lodge ski area and on the most popular climbing route. The glaciers are almost exclusively above the 6,000-foot (1,800 m) level, which also is about the average tree line elevation on Mount Hood."
Just found this quiz. I am rather doubtful as to Virginia getting above treeline. I am assuming that this is referring to the Grayson Highlands. While I have never been there, that a google search shows trees above the exposed areas, suggests to me that this is more along the lines of a bald, like those in the Appalachians further south, than a true treeline.
Additionally, it looks like the transition from deciduous trees to evergreens is roughly at the same height as the exposed areas. I would imagine that this area should show the same vertical progression as areas I have been like NH, where the evergreen zone is a couple of thousand feet tall between the alpine tundra and the northern hardwoods. As a result, I do not believe that the Grayson Highlands are tall enough to have a treeline.
Additionally, it looks like the transition from deciduous trees to evergreens is roughly at the same height as the exposed areas. I would imagine that this area should show the same vertical progression as areas I have been like NH, where the evergreen zone is a couple of thousand feet tall between the alpine tundra and the northern hardwoods. As a result, I do not believe that the Grayson Highlands are tall enough to have a treeline.