Here goes, though I kind of gave up baking pies ...
I'd refrigerate them. Most pumpkin pies are really a kind of custard, with dairy ingredients. I don't know what your sweet potato pie recipe is, but I'd imagine that also would keep its shape better if kept cool overnight.
I think these pies are better slightly cool, or room temperature, rather than warmed up.
The sweet potato pie is not in my family tradition, but in my oldest friend's family, it is, and she always brings me a slice. I have indeed successfully frozen it before. I have not attempted to freeze pumpkin pie, but I've seen frozen versions in stores, so I think that can also be done.
Last edited by saef; 11-24-2010 at 10:30 AM.
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