After deer hunting squirrels are my passion. I see you are just north of me.
Get in before daylight, especially if you have grey squirrels where you hunt. From mid-August through early Sept. find shagbark hickory (black cherry really early). I stake out these hickory trees (where evidence of cutting is). The trick is finding the squirrel when you hear the cutting. Then finding a clear shot. Acorns will be hit after the hickories are gone and then, much later walnuts will be hit. I'm usually deer hunting though by the time acorns begin to be hit.
The fox will hide on you if it sees or hears you. The grey will run.
I'd love to bowhunt them more but I sic Cooper rimfires on em.