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I would add Pine Siskin, Western Wood-Pewee, Ruby-crowned Kinglet, Broad-tailed Hummingbird, Chipping Sparrow, and probably others besides what Chuck and Nathan already mentioned, to the list of mountain species increasingly occurring at low elevation during summer. My take is that urban tree plantings, particularly in big yards, parks and cemeteries, are maturing and, thus, increasingly provide what these birds need. I imagine, depending on the year, fires and a shortage of conifer cones and other foods (i.e., habitat hardships in the mountains), also play roles in how many of the mountain species seek their fortunes elsewhere (think Red Crossbill).
Dave Leatherman
Fort Collins