It can vary but generally ice forms for good end of December into early January. Quiet coves freeze before wide open areas. I would recommend a thermostat for your bubbler. It won't be wasting electricity and running if we get a warm snap. Also understand that dock bubblers will not save your dock if the ice starts moving in the spring. I use 2 on my big permanent dock but I question the need every year. I guess they can't hurt. Previous owner was there for 40 years and never used one.
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