Some leaves are already beginning to change their colours, which is definitely a result of our extreme drought this summer.
While under severe stress due to the lack of water, trees will shut down earlier than normal.
Intense water stress, forces the tree into shutdown mode, this leads to a quicker color change and fall.
In short, public speaking terms, the tree moves into survival mode to ensure it has the nutrients to survive the winter and bloom next spring, which results in leaves changing colour earlier.
Adrian J.