They are good frozen though. We use them for snacks at soccer games. You can also roll frozen grapes in egg whites and then in granualated sugar to have frosted grapes. They are good too!I am not sure what the books will tell you but i have stored mine from one year to the next harvest and they were fine when used in a product like jam or jelly. The big thing with grapes frozen is when they unthaw they get sorta kinda mushy to simply use as a grape.