In frosting........ but I don't know about cake. 
I NEVER refrigerate any of my cakes and they all have sour cream in them. It will be fine on the counter. 
Sour cream has to be refrigerated!
NO it doesnt'. Not baked into a cake 
Can you not take all the shelves out of your fridge? I've been known to do that and pack everything else that should be in the refrigerator in coolers until I can get the cake delivered. Now I have a "beer fridge" that's really a cake fridge for that purpose.
Why would you refrigerate a cake unless it has a perishable filling? I'm with Leah_s, too many options for "no need to refrigerate" fillings. I'm just one that doesn't like putting a cake in the fridge.
Robin, I live in the northwest. If I leave a cake out on the counter it becomes dry as a bone. I mean literally. If I leave out a cupcake, for example, it's like a hockey puck the next morning. A cake that hasn't been iced will be hard and crunchy on the edges. I maintain a better level of humidity for my cakes by keeping them in the fridge. I also like them chilled way down for when I transport them.
I think those of you who have atmospheric humidity can easily leave things out. There have been quite a few threads here about this very topic. It's the humidity level that seems to make the difference, and I DO agree that people are insanely paranoid about leaving things out and feeling the need (unnecessarily) to refrigerate them. Once sour cream is baked into a cake, it's stable. It's helpful to learn some baking chemistry.
Ruth I know what ya mean. My son and daughter-in-law live in Alaska and my dil has the same problem. She's use to our Arkansas weather so she's never refrigerated a cake before. She says that she has to for the same reasons as you.
Yes the point I was trying to make is that it won't go "bad" if not refrigerated.
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