Winter growing isn’t just about surviving the storm but maintaining a viable microclimate. Weather durability is essential when investing in a greenhouse for serious year-round growth. Snow drifts, gusting winds, and freezing temperatures are realities in much of Canada and the northern U.S. Hence, choosing a greenhouse structure that can stand up to these challenges is key to protecting your plants—and your investment.
At Planta Greenhouses, we specialize in winter-engineered, snow-rated greenhouse kits designed for the climates most greenhouse companies shy away from. Every model is tested, trusted, and ready to handle extreme weather while delivering beauty, versatility, and ease of use.
Here are the top greenhouse kits you can buy online right now. They are built for snow, wind, and high-performance gardening.
1. Planta Greenhouse Sungrow Series – Our Flagship for All-Season Gardening
From lake-effect snowstorms in Ontario to howling gusts on the Great Plains, your greenhouse must be more than a shelter. If you need rugged, commercial-grade performance in a backyard-friendly package, the Planta Greenhouse Sungrow Series is our strongest recommendation. Designed with European agricultural engineering, it is framed to thrive in cold, high-altitude, and wind-prone environments.
Key Features:
- 85 PSF Snow Load Rating: Equivalent to 6 feet of packed snow—significantly higher than most greenhouses on the market.
- 65 MPH Wind Resistance: Tested against turbulent storms and blizzard-force gusts.
- Galvanized Steel Frame: Far stronger than aluminum; resists rust, bending, and fatigue over time.
- Arched Roof Profile: Promotes natural snow shedding to prevent load buildup—no shoveling required.
Structural Advantage: Superior Insulation and Temperature Control
Winter growing isn’t just about surviving the storm but maintaining a viable microclimate. The 6mm twin-wall polycarbonate panels act as double-glazed insulation, keeping interior temperatures stable even in sub-zero weather.
This allows growers to:
- Start seedlings early (even in February)
- Maintain winter crops like spinach, kale, and herbs.
- Extend growing seasons by 4–6 months or more.
With its bell-shaped, curved roof structure, snow naturally slides off, preventing buildup. Ideal for harsh winters in Alberta, Quebec, or the northern U.S., this series is favored by passionate and professional gardeners alike.
👉Explore the Sungrow Series at Planta Greenhouses.
2. Planta Greenhouse Sigma Series – Compact Strength, Big Value
The Planta Greenhouse Sigma Series offers a perfect balance of strength, simplicity, and compact performance for gardeners who face tough winters but don't need a massive structure. Engineered for northern climates, the Sigma is ideal for homeowners in snowy or windy regions who want serious protection without sacrificing backyard space or budget.
Key Features:
- Snow Load Rating: 32 PSF – capable of holding nearly 3 feet of compacted snow without deformation
- Wind Resistance: Up to 60 MPH – suitable for prairie gusts, mountain breezes, and coastal storms
- Frame: Heavy-duty galvanized steel tubing for superior load-bearing capacity
- Panels: 6mm twin-wall polycarbonate with UV protection and excellent insulation value
Structural Advantages: Compact Doesn’t Mean Compromise
Though smaller than the Sungrow, the Sigma Series maintains exceptional thermal insulation and durability. The arched roof design helps shed snow naturally, reducing maintenance and preventing structural stress. Whether growing spinach in January or hardening off seedlings in April, Sigma provides a stable environment.
- Northern gardeners with limited yard space
- Growers in mid-snowfall regions like southern Ontario, New England, or the Pacific Northwest
- DIY installers looking for a simple yet powerful setup
Perfect for growers in regions with moderate snow, this kit delivers outstanding protection and efficient use of space, without compromising on quality.
👉Explore the Sigma Series at Planta Greenhouses.
3. Urban Series – For Milder Climates with High Winds
The Urban Series includes the Sigma Urban and Sungrow Urban, two compact greenhouse kits designed for growing in smaller spaces year-round. Both models feature Planta’s signature heavy-duty, rust-resistant galvanized steel frames and 6mm twin-wall polycarbonate panels for insulation and light diffusion. With curved, tunnel-style shapes, they offer excellent airflow, snow-shedding, and wind resistance, making them suitable for moderate climates and urban backyards.
Sigma Urban: 8.2 ft wide × 10 ft long, rated for 32 psf snow load and 65 mph winds. Ideal for garden beds and efficient layouts.
Sungrow Urban: 10.5 ft wide × 10 ft long, with a taller design and extra space for vertical gardening and walk-in comfort. Also rated for 32 psf and 65 mph winds.
Key Features:
- Wind Resistance: 55–60 MPH – reinforced frame handles strong gusts common in coastal or exposed urban areas.
- Snow Load Rating: Moderate (recommended to clear heavy accumulation)
- Frame: Powder-coated steel for corrosion resistance and long-term stability
- Panels: 6mm UV-protected twin-wall polycarbonate, offering excellent thermal performance
Structural Advantages:
- Rounded Tunnel Design: The arched shape allows wind to glide over the surface, reducing pressure and risk of lift-off.
- Anchoring Base with Ground Stakes: The included steel base and anchors provide a solid grip on the ground, keeping the structure stable in storms.
- Heavy-Duty Frame: Made from galvanized steel, the frame is rust-resistant and engineered to withstand high winds without warping or bending.
- Tight Panel Sealing: Polycarbonate panels are secured with robust channels and clips, minimizing rattling and panel blowouts during gusty conditions.
- 6mm Twin-Wall Polycarbonate Panels: Provides insulation and strength while shedding snow naturally due to its slick surface.
- Arched Roof Design: Encourages snow to slide off instead of accumulating and weighing down the structure.
- Reinforced Cross Bracing: Interior braces add extra strength across the ceiling and walls, helping support snow accumulation during light to moderate storms.
- Galvanized Steel Construction: Supports weight effectively without sagging or corrosion—critical for snowy climates with fluctuating temperatures.
If you live in a climate where winters are windy but snowfall is manageable, the Urban Series offers a refined, dependable solution that blends into your lifestyle and landscape. Think of it as a cozy, beautiful escape that doubles as a growing space—even during shoulder seasons.
Explore Urban Series at Planta Greenhouses.
Why Snow & Wind Ratings Matter
Based on your regional planting zone in the US or Canada, you already know how unpredictable winter can be. Choosing a greenhouse with a tested snow load (measured in PSF) and wind resistance ensures your structure won’t collapse during a blizzard or lift off in a storm. Discover your planting zones and understand more about why planting zones matter.
Find various collections of Planta Greenhouses, where every kit we sell is engineered for peace of mind—and backed by real-world success stories from Alaska to Colorado.
Ready to Grow With Confidence?
Whether homesteading in the Yukon or growing tomatoes in a Vermont backyard, we offer solutions tailored to your climate, space, and goals. With nationwide delivery, free off-season storage, and step-by-step installation support, Planta Greenhouses takes the guesswork out of buying online.
Start your year-round growing journey with a greenhouse as strong as your gardening ambitions.
Know what our customers have to say and then decide for yourself.