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Hayzee is correct there is no need to drain the pond over winter. A couple of things to think about, you do need a pump otherwise the water will stagnate and while frogs might like it, very little else will including your nose over time. As well if you drain it the lily pad bulbs will die over the winter, they do not like to be frozen at all.
I lived in Ohio for a number of years and had a moderate sized pond with Koi fish, I kept the pump going all year round, one of the biggest benefits is the splashing water will help keep that area of the pond from freezing over thus allowing ammonia (if you have fish) from being trapped in the water by an ice cap. Now that I said that, common sense also comes into play, if it gets cold enough....long enough even splashing water will eventually freeze over, so just keep an eye on it and if need be break off any closing in ice. If you do get fish, stop feeding them when the water temperature gets below 50 F, don't worry over winter they will not starve to death.
PS you can also buy pond heaters that specifically keep a circle of water ice free, they are not that expensive and are cheap to run, they don't keep the entire pond ice free just the 8" or so that is their size.
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