You can freeze white chicken chili for up to 3 months. Before you put it into a freezer safe container or gallon freezer bag, let it cool completely. Once cooled just seal it up in your container and store in the freezer until you are ready to use.  When you are ready to eat it, defrost it in the refrigerator first. Once it is defrosted you can reheat it in the microwave or on the stove top over medium low heat.