Water freezes at 32F.
If it's 6% ABV, it won't freeze until about 28F.
If it's 10% ABV, it won't freeze until about 25F.
If it's 15% ABV, it won't freeze until about 20F.
If it's 20% ABV, it won't freeze until about 14F.
If it's 40% ABV, it won't freeze until about -22F.
If it's 60% ABV, it won't freeze until about -50F.
If it's 80% ABV, it won't freeze until about -95F.
If it's 100% ABV, it won't freeze until about -173F.
That said, if your applejack is only around 10% or 15% ABV or so, it should freeze in most freezers no problem. If you've ramped it up to 30% or 40% ABV, then it probably won't. And then the question would be, why are you trying to freeze it?
I'm assuming you are using a freezer. But still, the higher the ABV, the lower the freezing point and the more time you'll need.