if you put an airstone in the tank outside it wont freeze.
Right now Id test it in a garage rather then outside. the past two days here would have worked great, even today but the overnight lows starting tonight are gonna be in the 30's for about a week.
Ive got mine on 2x4's in the garage holding water now. its been in there for 3 weeks full of water now. Im just up the way from you, Im near schaumburg.
That's not a planted tank. That's a jungle with glass around it- MFDROOKIE Circa 2011