Kumquats can appear in markets from October (at the earliest) through June, and during some unpredictable off-season times as well. Considered a winter fruit, their golden color is a welcome sight. Select fruits that are firm, not soft. Because of their skin, they tend to spoil more easily than thicker skinned fruits such as oranges. Kumquats will last a few days at room temperature or for up to two weeks in the refrigerator. The entire kumquat is consumed in a bite or two. Because of their size and color, they are also great as drink garnishes or as an addition to salads. Wash kumquats before serving.