The best way to keep grapes fresh is to place them on a paper towel in an open container. The paper towel removes moisture from the fruit.
Fresh grapes can be stored in the refrigerator for 5 to 7 days before they start to spoil. If properly stored, grapes can be frozen for 10 to 12 months.
It is advised that grapes not be washed until it is time to eat them. This prevents the moisture from ruining the fruit.
The stems of the grapes should be removed before freezing them. Grapes should also be washed and dried well before they are frozen.