Are mashed potatoes good after being frozen?

Yes. (Frozen dinners often have mashed potatoes in them.) I usually add more liquid to mashed potatoes before I freeze them so they don't get too dry when reheating. Or, you can add a bit more liquid, if needed, when you reheat them.

If you whip them well ,then will freeze very well.But doing it with a hand masher;they don'tcome out well when unthawed.Get them nice and light ,and add just enough liquidto bind them .To much liquid and they'll be heavy ,and don't freeze as well.