I've talked with a few people who hunted squirrel and they tell me not to hunt them till after the first frost.
I've also heard this but we always hunted just about as soon as we could.
A few years back a guy I hunted with left a squirrel lay because it had warbles, game warden had shown up and asked the usual questions. When Mike walks out and the questions start Mike mentions the squirrel that he left because of the warble, GW was upset, go get it NOW!
I'm thinking Mike has a fine coming, lost hunting privileges and maybe his shotgun. An uncomfortable 10 minutes passes and here comes Mike, GW takes the squirrel, cuts around the ankles of the rear legs, up the back of both to the rectum, severs the tail joint, stands on the squirrels feet and pulls off the hide about like you would a sock.
There it is, the warble is between the meat and the hide. GW explains a few things to Mike, looks at me and I agree,,,,, you know I did.
GW leaves. All is well, we eat lunch do the usual cleanup and head back into the woods