Yes, you can freeze it, provided that you hold off on frosting the cake until after it comes out for consumption. Most frostings do not hold up well to freezing conditions over long periods of time. Stored in an airtight container or freezer bag, it should last for up to 3 months in the deep freeze. To thaw, simply leave it out on the counter for a couple hours before frosting. Once properly thawed and frosted, it's ready to eat!