Cold frame?

Presque Isle, MI(Zone 5a)

Do well insulated cold frames freeze in the colder Michigan months. Does any have one that don't freeze?

Thanks

Gary

Bay City, MI(Zone 6a)

Gary
the nites are what get way to cold here in mich.
my GH can get to 75 when its only 20 outside as long as the sun is shinning but will
cool down as the sun sets!!early!!

here is a way maybe to keep it warm
http://www.gardening.cornell.edu/factsheets/vegetables/coldframes.pdf
http://www.savvygardener.com/Features/cold_frames-hotbeds.html

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