Potentially dumb question

Sorry to bother you all, but I was struck by a somewhat dumb question while drinking and browsing videos of chimps in various sanctuaries. If some kind of tragedy happened, and all the chimp sanctuaries and zoos across America in a sudden event, what are the chances that some kind of feral ape or chimp population would be able to form in North America? Would they be able to survive the climate on their own? Or would they migrate south in search of more temperate climes?