I freeze all my cakes and they come out more moist. I usually wrap my cakes 5-10 minutes after I take my cakes out of the oven while they are still warm. Then I take them out 8-10 hours before I decorate them and thaw them in the refrigerator. I don't know if it makes a difference if you thaw cakes/cupcakes in the fridge or on the counter. I just don't trust the humidity here in TX.