I have heard a buck grunt in January. Here in Jersey that is long after the main rut! If the buck / doe ratio is out of wack and you have a lot more doe's then bucks you can have a second, third even fourth rut with the doe's that didn't get knocked up the first time round.....I don't think grunting would spook a deer off thats not rutting but he may not be interested either....Good Luck