Collection: Extreme Cold Greenhouses (Zones 3–4)

Built for extreme cold — Zones 3–4 covering Minnesota, Wisconsin, Montana, North Dakota, and Canada border states. Temperatures below -20°F and snow loads up to 50+ lbs/sq ft. Snow One 6mm Heavy Duty is the primary recommendation. Aurora Glass panels are the strongest available and handle extreme conditions. CASA Wooden is not recommended for these climates.