Can I freeze custard?
Custard does not freeze well, it has a tendency to separate. If you do freeze it, freeze it right away, leave it frozen for as little time as possible, and defrost it in the refrigerator. I wouldn't leave it in the freezer for more than a month.

One way to freeze custard and get great results is to make ice cream! If you have an ice cream maker, great. If not, that's OK too. Custard based ice creams get less icy than other types of ice cream when made without churning. Just thoroughly stir every half an hour while freezing for at least three hours.