Fully ripe oranges store well in their own skins or sliced and ready to eat. When selecting oranges, choose those with smooth skin and a fragrant scent that feel heavy for their size. Avoid dry, wrinkled or mushy oranges, signs that they are already beginning to spoil.
Store Them Whole
Whole oranges store best unwashed, because moisture on the skins can lead to mold and spoilage. Store the oranges at room temperature out of direct sunlight or in the refrigerator for up to two weeks, depending on your preference. Keep them in a net bag or an open bowl so air can circulate freely around the oranges.
Slice Them Up
Wash oranges in cool water before slicing them. Use a clean cutting board and knife to prevent cross-contamination. Package sliced or sectioned oranges in a sealed bag or airtight container. You can store them in a refrigerator at 40 degrees Fahrenheit for up to four days. For longer storage, freeze the sections in a sugar syrup made from boiling 2 3/4 cups sugar for every 4 cups of water. Frozen oranges store for up to 12 months.
References and ResourcesUtah State University Extension: What Is the Best Way to Store Fruits and Vegetables
Texas Cooperative Extension: Safe Handling of Fresh Oranges
Still Tasty: Oranges -- Fresh, Raw, Cut-Up