Storage of Sweet Potato Pie
I've frozen custard pies and they keep well. Be a bit careful when defrosting: if you leave it out in a humid environment, condensation will soak into the crust and make it soggy. Some tips: wrap some foil around the crust on the edges, freeze in a bag,and defrost in the fridge (still in bag). After it is defrosted (at least mostly), keep the foil in place and put it into a hot oven for 5-10 minutes to crisp up the crust and dry out any condensation that has formed.

I've kept pies for a week, and there were no issues. I imagine they will keep for something between 1 and 3 weeks if refrigerated, so there is no reason to freeze if you plan to eat them within a week.