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.

See our full state guide: Best Greenhouse for Minnesota.