Freezing apples for apple pie involves coring, slicing and possibly peeling them. Apples can be frozen alone or already in a mixture for making an apple pie.
To freeze apples for a pie, wash the apples thoroughly. If you are peeling the apples, do this first. Cut the apples into quarters, and cut away the core from each quarter. Alternatively, use an apple corer to remove the core. Then, cut the apples into eighths.
It is necessary to preserve apples so they don't turn brown. One option is using a pre-made fruit preserver. For this option, follow the package directions. Otherwise, pour 1 cup of warm water into a large bowl, and add 1/4 cup salt. Stir until dissolved. Add 2 quarts cold water to the mix. Another method is omitting the salt and using 2 tablespoons lemon juice.
Place the sliced apples in the preserving solution. Soak them for 10 minutes. If you are freezing them alone, place a single layer of apples into individual freezer bags. Lay them flat in the freezer.
Another option is making the filling for the pie and freezing it. For that option, mix 3/4 cup sugar, 1 1/2 teaspoons cinnamon, 2 tablespoons flour and 1/2 teaspoon salt in a separate bowl. Pour the mixture over enough apples to fill a pie tin, tossing them to coat well. Place the apples in a zip-top container, and freeze.