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Nestle's themselves (own the Libby's brand) suggest the following:
http://www.verybestbaking.com/advice/...
- Pumpkin pie is a custard-type pie and freezing of this type of pie is not recommended. However, you can make the pumpkin filling and pie shell ahead and freeze each separately up to 1 month. Defrost both before filling shell with pumpkin filling. Stir filling to be sure all ingredients are well mixed.

