Above the tree line, Mt. Hood is a big pile of rocks and fine volcanic ash. The fine sand makes for strenuous hiking, especially when combined with the thinner air at this elevation. The open skies here can be good for raptors. On this day I just saw two Red-tailed Hawks, a Prairie Falcon, and several Common Ravens.
The Pacific Crest Trail runs through areas with a few more trees. Dark-eyed Juncos, Golden-crowned Sparrows, Pine Siskins, Ruby-crowned and Golden-crowned Kinglets, and Yellow-rumped Warblers were the most common species in this habitat. Nala would stop and rest in every little patch of shade she came to. She has a lot more stamina when she is swimming than she does when hiking in hot dry habitats.
Timberline Lodge (Birding Oregon p. 74) is a great place to for some high-elevation birding in the Cascades. A good paved road leads right up to the treeline, and you can access the Pacific Crest Trail just uphill from the lodge. The parking lot is often full of tourists and skiers, even in late summer. But if you are willing to walk for a while, you can enjoy solitude and stunning scenery.
I drove up to Timberline Lodge on Mount Hood today. This is a great area to search for alpine species, and the paved road makes it easy to access. Autumn has settled in already, with a fresh dusting of snow on the mountain. The ground had frozen overnight, and the thawing this morning released a near constant stream of falling rocks on the gravel slopes. (While it looks very dramatic when covered in snow, Mount Hood is actually a big pile of gravel and fine volcanic ash.) Most of the birds seem to have left the area around the lodge for lower elevations. I found a couple of Golden-crowned Sparrows, Robins, and Red-breasted Nuthatches. A flock of ten Common Ravens rode an updraft around the summit.
Golden-mantled Ground Squirrels are common on Mount Hood.
After descending the mountain, I visited the meadows and forest around Little Crater Lake (Birding Oregon p. 75). Gray Jays and a Pileated Woodpecker were the bird highlights. The color of this little lake is an eerie turquoise. Despite the near 40′ depth, you can see the bottom in great detail.