You can ripen kiwifruit by letting them sit at room temperature for 3 to 5 days. Kiwis are ripe then they are are slightly soft to the touch.

You may also store ripe kiwifruit in the refrigerator for a few days. By storing them in a plastic bag in the refrigerator, you will help them retain their moisture, and they will stay fresh for 2 to 3 weeks.

You can also speed up the ripening process if you place kiwis in a paper bag with fruits that produce ethylene gas (apples, bananas, pears).