From RodentPro:
How long will the frozen prey items last in the freezer?
Depending on how they are stored, most frozen foods can last up to 12 months. It is a good idea to minimize any exposure to air by using air tight freezer bags. While we recommend not storing prey items without fur or feathers for more than 4 or 6 months and prey items with fur or feathers for 9 to 12 months, if properly sealed containers are used and air exposure is kept to a minimum, they can be kept for much longer.
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