These muffins should be stored in an airtight container at room temperature for up to 4 days. If you live in a humid climate, or in the summer months, you may prefer storing it in the refrigerator. u003cbr/u003eu003cbr/u003eWhile muffins do not have to be stored in the refrigerator, you may wish to do so to extend their shelf-life. In the refrigerator, they will be good for up to 7 days.