Real easy way to tell if its the "right" time for you to see change in your wee trees....look at the big trees!
I would expect so, shorter day light hours, cooler temps. I know on my drive from York to Baltimore I can almost measure the change in tree color every ten miles or so as I come down in altitude. Closer to the bay its warmer and the leaves on the trees are much greener....
So in Wheeling...you should start your transition very soon, if your not in a full blown transition right now.