I was always told not to eat squirrels until after a good hard frost, by all of the old timers around here. They always would say that the squirrels would have warbels if you shot them before a frost. Warbels are fly larva that grow under the skin of a mammal. I don't really know if that is true or not, when I was a kid my dad would never let us hunt squirrel until october even though season came in the end of august. In my adult life have rarely had time to hunt squirrel before October because of work and by then It is all about whitetails. I can't really imagine that one good frost would get rid of these warbels, however the fly population is usually gone by then. I hope someone here will have some good facts to prove if this is true or if in fact it is an old wives tale.