I spent a morning above the tree line in Rocky Mountain National Park. We saw more mammals than birds (next post), and the two target species, Brown-capped Rosy Finch and White-tailed Ptarmigan, both eluded me. But any trip to this area is well worth it, whatever you manage to find.
Other species seen but not photographed included Golden Eagle, Horned Lark, and a couple of fly-by hummingbirds, probably Broad-tailed. So there was not a huge bird list by the end of the morning, but it is a treat to visit this habitat at an elevation over two miles higher than my home in Portland.