Signs of autumn

There are few signs of autumn here in the desert.  My cottonwood tree does start to yellow, but it doesn't lose all its leaves.  The sycamore trees at the Living Desert DO lose their leaves, however, I don't get over there much anymore.

So, I look for signs of autumn up in our local mountains.  There certainly are signs of autumn up there and they will continue for a few more days?  weeks?  I'm just not sure.  Here are a few.