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Carrot cake stays fresh for up to 2 days when stored in an airtight cake container or storage bag at room temperature, and up to 6 months in the freezer. The refrigerator gives the cake about 1 additional week of freshness when wrapped effectively. Frosted cakes keep best because icing acts as a seal to retain moisture. However, most varieties of frosting do not lend themselves well to freezing and thawing, so freeze carrot cake unfrosted and decorate it after it thaws.
Store a whole or partially portioned carrot cake in an airtight container on the counter out of direct sunlight for a couple of days.
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Prolong the shelf-life by up to one week by wrapping individual slices in plastic wrap and storing them in the refrigerator.
Freeze individually wrapped pieces in a single layer on a cookie sheet or cutting board for about one hour or until firm. Transfer the partially frozen slices to an airtight container or plastic freezer storage bag. Mark the date on the container or bag. Store carrot cake for up to 6 months in the freezer.
Carrot cakes vary widely in richness. Recipes using higher quantities of ingredients such as butter, eggs, carrots, coconut and crushed pineapple keep better than simpler recipes.