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What happens when you run out of space in your cold frame? If you have Delta Park Gable Roof Cold Frame, you simply add another one with the brackets provided. Each module provides one square meter (39.4- x 39.4-in.) of growing space.

This cold frame features polycarbonate side and roof panels that are adjustable and removable for ventilation, with good light transmission and insulation.

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The Haxnicks Mini Greenhouse provides 1.67- x 3.25-ft. of growing space, and the curved roof lets light in from every angle. A handle makes this small cold frame easy to move.

It features a black galvanized steel frame and UV-resistant clear plastic cover, with adjustable air vents on each end. Ideal for kitchen growing, this fits as well on a porch or patio as it does in the garden.

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Another wooden cold frame, the Cedar Cold Frame Garden from Home Garden LLC features long-lasting, well-insulating cedar frame, a double-walled polycarbonate lid and 2- x 4-ft. of growing space.

Heavier than most, this will probably stay in one spot, but it’s attractive enough to be a centerpiece wherever you put it. And did we mention it’s handmade? It comes in sections easily assembled with a screwdriver, thanks to the easy-to-follow instructions.

What to Consider When Buying Cold Frame Greenhouses

• Size: Cold frames are built with little headroom to maximize warming, but footprints vary. Anything less than 4- x 8-ft. is considered portable. Larger cold frames are best left in one place.
• Lids: Hinged lids allow access to what’s inside. Some cold frames have more than one lid so you can reach some plants or germinating seeds without disturbing others.
• Frame material: Common greenhouse materials include glass, wood, polycarbonate, fiberglass and aluminum. Wood, the heaviest and best-insulating material, is most suited for a stationary installation. Aluminum is generally the priciest and longest-lasting. Some frames feature an aluminum structure supporting polycarbonate or glass panels.
• Lid material: Because the lid must be transparent, these are usually glass and polycarbonate. Glass weighs more and it’s stronger, so it’s better for windy conditions.
• Ventilation: Most cold frames feature hinged lids that can be adjusted or removed. If the lid can’t come off, there should be vents on the sides.

Why You Should Trust Us

With more than four decades of experience in the building trades, I have a wealth of hands-on expertise. As the co-owner of a California property independent of the electric grid, I have a deep understanding of solar power and its applications. This makes me well-versed in the specific needs and benefits of cold frame greenhouses. I’ve also contributed to major construction projects and co-established landscaping companies. In addition, I’ve worked extensively as a carpenter, landscape builder and furniture refinisher.

Since turning my focus to writing, I’ve published and consulted on more than 10,000 articles for Family Handyman, Hunker.com and more. I’ve also served as an online building consultant for Home Depot’s Pro Referral service, further establishing me as a trusted source for reliable home improvement advice.

How We Found the Best Cold Frame Greenhouses

When selecting the best cold frame greenhouses, we researched a wide range of options to understand the features and benefits offered by different models. Next, we analyzed customer reviews to gain insights into real-world experiences with these products. Our evaluation focused on factors such as durability, insulation, size, affordability and ease of assembly. We also looked at the effectiveness of extending the growing season. The result is a curated list of the best cold frame greenhouses to suit every space and budget.

FAQ

What is the purpose of a cold frame greenhouse?

A cold frame greenhouse is designed to extend the growing season by providing a protected environment for plants. It helps to retain heat from the sun, which creates a microclimate that is warmer than the surrounding outdoor temperatures. This allows gardeners to start planting earlier in the spring and continue growing later into the fall.

Does a cold frame need to be in the sun?

Ideally, you should place a cold frame greenhouse in a sunny location to maximize its effectiveness. The sunlight helps to heat up the interior of the cold frame, which creates a more favorable environment for plant growth.

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