We've had a wet summer so far here in the Missouri Ozarks, we're about 10" above normal. I notice poison starting to turn in hedge rows and along fence lines. I don't notice trees starting to turn yet. Just this morning I heard acorns falling with some hitting the metal roof on my garage. Squirrels are running around the yard with acorns in their mouth.

I don't know what signals trees to start turning or what makes some years more colorful than others. Usually peak color around here is mid October.