How long does homemade canned grape jelly keep?

Homemade canned grape jelly can typically last for about 1 to 2 years when stored in a cool, dark place. Once opened, it should be refrigerated and consumed within a few weeks for the best flavor and quality. Always check for signs of spoilage, such as off smells or mold, before consuming. Proper sealing and canning techniques can help extend its shelf life.