The best way to keep raisins for a practically indefinite period is to combine two of these methods.

Using a vacuum sealer and then freezing your raisins will allow you to keep them for upwards of a year, and potentially much longer. The downside of this combined process compared to simply freezing your raisins is that you cannot easily access them for continued use.

Storing your raisins in jars is great because these containers are sturdy and cannot be penetrated by pests. However, similar to vacuum-sealed bags, you cannot simply close the lid and call it good once you open the jar to access your raisins. You will have to repeat the process with another oxygen absorber, although this is not always recommended.