Does Whipped Ganache Need to Be Refrigerated?

Ganache is fine at room temperature for a couple of days. But any longer than that, and it should probably go into the fridge. It will stiffen up and harden quite a bit when kept cold. If it becomes too stiff, just allow it to come to room temperature.

How long can whipped ganache sit out?

The general rule is that classic ganache may stay at room temperature for up to 2 days then must be refrigerated. If you'd rather be safe (which I recommend), keep it refrigerated for all storage.

Does a cake covered in ganache need to be refrigerated?

Ganache frosted cakes (boiling whipping cream poured over bittersweet chocolate): Store at room temperature about 3 days or up to 1 week in refrigerator. ... Cakes, whether kept at room temperature or in the refrigerator, should be stored airtight to keep them fresh and moist.