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If this is your first time shipping or you have not shipped many times before I'd hold off until you are sure the temperature is adequate. I've never heard of heat packs freezing before nor have I ever had it happen. Reputable folks will know when it is alright to ship and when it is not. If the temperatures go too low even some of the better packagers/shippers will not ship until they go back up again.
For the sake of the animals (and to save yourself a few headaches) just wait until you are comfortable shipping out.
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