Chemical changes-such as rancidity-can also occur over time in the freezer, making the meat inedible. So the turkey could keep well for longer than 6 months or even a year, but there is no point to hanging onto it that long.Alternatively, look on the plastic bag the turkey came in and it will tell you.or best taste, eat your commercially frozen turkey within 6 months. It will be safe to eat for much longer than that since pathogenic bacteria will not grow at proper freezer temperatures-although it may not be as tender and juicy. And this is assuming it has never been defrosted.