How to Care for a Goldfish Pond During the Winter Months. Goldfish and koi aren't afraid of cold temperatures. Jupiterimages/Photos.com/Getty Images. Goldfish survive below-freezing temperatures by going into hibernation, but only if they receive plenty of oxygen.Keeping ice off part of your pond is crucial.The fact is, keeping your goldfish alive outdoors during the winter requires year-round diligence -- but not a lot of your time.ce. Ice is an enemy in winter. If your pond is at least 3 feet deep, it's unlikely to freeze completely. However, even a thin layer of ice covering the surface traps harmful gases inside and keeps oxygen out. If those gases aren't allowed to escape and be replaced by oxygen, the fish will suffocate.
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