Fall is subtle in most of the Sonoran desert; saguaros don't exactly have leaves that erupt into color. But in the riparian canyons, where cottonwoods line the creeks, there are corridors of autumn foliage to be found.
I took my iPhone with me this morning on my run in Sabino Canyon, on the NE edge of Tucson. The cottonwoods are just beginning to turn...
...about two-and-a-half miles into the Canyon:
...we haven't had a hard freeze yet,
so a few summer wildflowers are still blooming:
...in the mid-morning sun, reflection of cottonwoods beneath "The Acropolis:"
There are still a few weeks left to enjoy the desert canyon autumn--the sycamore and ash haven't really begun to turn yet; most years, peak color along Sabino creek is isn't until late December.