This has been an uncharacteristically warm and pleasant non-autumn in my part of the mid-west (central states). It went all the way down to 50°F last night and has been at least the high 60's in daytime in September and half of October. I would characterize this as a very long summer, so if some short season trees are acting a little funny and seem to be growing like it's spring, I wouldn't worry about it, and there's nothing constructive that can be done anyway. Anytime a tree is upset in its growing cycle it can be expected to try to recover if the growing conditions permit. There is no way for the tree to know about things like calendars, -they just respond to conditions of the moment, and the conditions right now are not fall-like. Doing anything at all other than adding protection like sinking the pot and mulching so the roots assume the cooler temperatures of autumn and winter may be problematic. The normal autumn/late summer tree growing conditions of diminishing sunlight and photoperiod, drier & cooler weather, and leaves that are getting close to the limits of their lifespan, conditions that en toto signal to the tree to switch growing to roots and maturing next year's buds instead of continuing to nourish leaves which dry up and blow away. Those signals are 60 days late. Next year may get even with us and this will disappear into the averages as an aberrant year that proves the rule.
At least, some good will come of this kind of autumn in the north: the Azaleas that are longer season plants of the south that are in our northern landscape and bloom every-other-year will have had long enough to set seed and flower buds so next spring should be better than average for us for Azaleas. (He said, perhaps prematurely.)