I know of a few people up here who keep winter koi in their pond... and you don't need to live here to know that it gets colder here than Calgary. Like reef_raf said, as long as your pond is deep enough under the frost line and you have enough circulation, your koi should be ok... unfortunately, I have to agree with the fact that 2 feet isn't enough. I believe one of the people here told me that his pond is 4-5 feet deep. Another option you can consider is buying a kiddie pool and putting your fish and plants in there. A couple of flourescent lights should be enough to keep your plants alive until the thaw comes again.
HTH
-Richer
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