If you simply make sure that your pond is at least two feet deep the proximity of the earth to the pond s surface will not allow the latter to freeze any deeper than 8.
Outdoor koi pond in winter.
They spend most of their time treading water at the bottom of the pond while sometimes swimming around a bit.
They can survive water temperatures as low as 0 c which means they can survive in the pond during the winter as long as it doesn t freeze solid and they have adequate water quality and oxygen.
It doesn t matter how deep the pond is it just matters that the water is moving and not frozen.
That leaves 16 for the fish to lounge around and basically hibernate over the winter.
21 c or they may be stored as a dormant tuber.
Goldfish and koi are very hardy fishes.
The basic principle for winter pond care is as long as the water is circulating and there is an air hole to allow oxygen in and gases out fish and plants should be fine.
In the wintertime when the water in your pond is ice cold the koi fish s metabolism slows down to a crawl.
Goldfish and koi can survive winter outdoors so long as ponds don t freeze completely freeze solid.
To help ensure healthy fish in the spring follow these steps.