Because these pies are already housed in their own jars, you can simply pop the lids on and store them in the fridge! The tighter your lids are, the longer these pies will stay fresh. Key lime pie jars will be good for roughly 5-7 days in the fridge and are best served cold. You can also freeze these pie jars for up to 3 months. Thaw in the fridge for at least 4 hours or for 30 minutes at room temperature before digging in!