Country Lore: Creating Roll-Top Cold Frames

Readers’ tips on DIY cold frames for convenient year-round growing and plant protection, unsticking stuck canning jar lids, and more.

By Mother Earth News Readers
Published on July 9, 2019
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by Martha Ann Burgard
Martha and Richard’s ingenious roll-top design allows them to easily cover or uncover their plants, depending on the weather.

Come Rain or Shine

I’ve been farming my whole life. When I met my friend Richard about four years ago, we discovered that we’d both spent our entire lives on the same path to self-sufficiency, thanks to MOTHER EARTH NEWS. Over time, we explored different ways to improve our growing systems, including researching the best cold frames and experimenting with different types of cold frame covers for year-round protection.

Together, we designed this roll-top solution for our cold frames. As a frost buffer for the plants inside, we built a wooden framework on top of the cold frame and then covered it with sheet plastic, creating a durable cold frame cover that works in all seasons. The framework’s front is 12 inches tall, angling up to 18 inches tall in the back. The cover of the framework is simply a piece of greenhouse plastic tacked down along the framework’s back side. The front edge of the plastic is sandwiched between two 1x2s. These 1x2s extend the length of the cold frame to keep the weight of the wood from ripping the plastic off. The weight of the 1x2s keeps the plastic in place when closed.

To open the cold frame, I simply roll the 1×2 toward the back edge, wrapping the plastic around it. This makes the system flexible compared to traditional cold frame covers that need to be removed entirely. To keep the rolled plastic in place at the back of the framework, I screwed one end of a short board inside both back corners. When I want to unroll the plastic, I just flip the boards down.

The great thing about the roll-top is that it’s usable year-round. When the cold frame is open, the roll-top is out of the way, which allows the rain to come in naturally. This makes it one of the best cold frames for gardeners who want both protection and flexibility. The roll-top works best on individual beds that aren’t too long. The longer the bed, the harder it is to neatly roll up the plastic. That said, I do use this technique on one of my 16-foot-long beds, with two 8-foot-long boards on the weighted end to span the length of the bed.

Frequently Asked Questions

1. What is the best cold frame for home gardening?

The best cold frames are those that provide insulation, durability, and easy access to plants. A roll-top design with flexible cold frame covers is highly effective because it allows ventilation, rain access, and protection from frost without removing the entire cover.

2. What are cold frame covers made of?

Cold frame covers are typically made from greenhouse plastic, polycarbonate panels, or glass. Many gardeners prefer plastic covers because they are lightweight, affordable, and easy to roll or adjust depending on weather conditions.

3. How to make a cold frame from plastic bottles?

To make a cold frame from plastic bottles, collect clear bottles, cut them, and assemble them over a wooden or metal frame. This DIY method creates insulation pockets that trap heat, making it a cost-effective and eco-friendly cold frame cover solution.

4. What is a dark cold frame and when should you use it?

A dark cold frame uses thicker or shaded materials to retain more heat and reduce light exposure. It’s useful in extremely cold climates where heat retention is more important than sunlight, especially for overwintering plants.

5. Are cold frames useful year-round?

Yes, the best cold frames can be used year-round. In winter, they protect plants from frost, and in spring or summer, adjustable cold frame covers allow airflow and rain exposure, making them versatile for all seasons.

6. How do you maintain cold frame covers?

Cold frame covers should be cleaned regularly to allow maximum sunlight through. Check for tears in plastic covers and ensure they are securely fastened to avoid wind damage.

7. Can cold frames replace greenhouses?

Cold frames are a simpler and more affordable alternative to greenhouses. While they are smaller and less controlled, the best cold frames can effectively extend the growing season and protect crops in most climates.

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