I am north of you in Milwaukee. I cover my pond in winter.
http://weloveteaching.com/mypond/winters/winter.htm
it is a very simple lean to. it is high enough over the pond so snow doesnt make the
plastic sag down into the pond.
I now use a 500 watt aquarium heater in the pond along with a bucket filter and I
feed my koi 11 months of the year. before the heater they wouldnt eat for 5-6
months. Ingrid

cymric wrote:


I live in the Chicagoland area and have a new pond. Its about 2-3 feet
deep in the middle and about 7 feet across. I have six goldfish and
one Koi and wonder if they can overwinter or do I need to bring them
inside?



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