23 EASY COLD FRAME PLANS TO EXTEND THE GROWING SEASON HOW TO BUILD COLD FRAMES FOR YOUR WINTER GARDEN

As the cold weather starts to come on, many of us sigh and look forward to the start of the spring again, when we can once more grow fresh vegetables and fruit for our tables. But it doesn’t have to be like that! There’s many cold-weather vegetables that can easily grow with just a little protection. And building a cold frame is the perfect solution.

While a cold frame can be as simple and small as a plastic 2-liter bottle with the bottom cut off, carefully placed overtop of a plant to offer a little more warmth, what I’ve got for you today is a list of 26 different concepts and plans for winter cold frames that encompass a bit more space in your garden and allow for a better collection of vegetables. So whether you’d like to grow spinach or beets, protect your flowers or even start a few seedlings early on, there’s a plan here for everyone.

Since there’s a variety of materials that can be used to construct cold frames, I’m going to split these up by the clear material used on the top of the frame. From there, the only limit is your imagination!

1.Plastic Sheeting/Soft Plastic Cold Frames

Simple Cold Frame

This particular cold frame is not elaborate, but it works quite well. Made of plywood and poly sheeting, its sloped shape allows for rain drainage while keeping the plants within warm in the cooler months of the year.

 

 

Materials: Plywood, poly sheeting, misc tools and bolts/nuts/screws.
Dimensions: 4’ wide x 4’ deep, sloped top peaks at 15”
Difficulty: Beginner to intermediate
Cost: $$

 

2.PVC Cold Frame

Constructed entirely of PVC and plastic sheeting, this basic PVC frame keeps warmth inside and allows ease of access through its triangular hinged roof. The plastic sheeting can be easily replaced year after year as needed.

 

 

 

Materials: PVC and PVC connectors, 6mil clear plastic sheeting, pipe glue
Dimensions: 4’ wide x 2’ 4” deep
Difficulty: Beginner
Cost: $

 

3.Lightweight Lid Cold Frame

This fascinating, lightweight cold frame was designed for use with an temperature-controlled automatic opening vent, and it’s really cool!

If you’re concerned that your plants will get too warm while you’re at work during the day, this design is perfect, as the lid will open itself and close itself in response to the ambient temperature.

 

 

Materials: Lightweight wood, 8mil vinyl sheeting, PVC pipe, automatic venting control (like a Univent)
Dimensions: 3’ wide x 6’ long
Difficulty: Intermediate
Cost: $$$

 

4.Cold Frame Tent

If you have existing raised beds, all you need is the top for this to rest on top of your beds. If you don’t, add a box around your garden plot, and with very little difficulty, you are set up to endure the weather while still growing plants to a reasonable height!

 

Materials: Heavy plastic sheeting, lumber, a hardwood dowel, screws or nails
Dimensions: Variable depending on need
Difficulty: Beginner to intermediate
Cost: $-$$

 

5.Sleek & Efficient Cold Frame

This functional cold frame is intended to be constructed for an already-existing raised bed. While a slight variation to the design would enable runoff from rains to move more easily, it’s a great option for people in cold but less-rainy environments just as it is already.

 

 

Materials: Lumber, heavy plastic sheeting, screws or nails
Dimensions: 4’ wide x 8’ deep x 15” tall
Difficulty: Beginner
Cost: $

 

6.PVC Cold Frame Hoop House

This arched hoop house-style cold frame is not elaborate, but it does the trick! Made to fit just inside the walls of a raised bed, the two plywood ends keep wind out of the tunnel, and the plastic sheeting overtop allows plenty of light to reach your plants.

 

Materials: PVC, plastic sheeting, plywood, 2×3 studs, misc screws and other assorted equipment
Dimensions: Variable, can be adjusted to fit most raised beds
Difficulty: Beginner to intermediate
Cost: $-$$

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7.PVC Cold Frame Hoop House

This one does not come with exact plans, so it takes a little bit of plotting to recreate it. However, it’s a simple enough structure. It’s adorably cute, as it looks like a little house, and it’s incredibly useful, as only half the lid needs to be lifted to access the plants inside or to provide ventilation.

 

Materials: Lumber, plastic sheeting, hinges, nails or screws, and a chain with spring for each end
Dimensions: 66” long x 24” wide
Difficulty: Intermediate
Cost: $$

8.Plastic Bottle Cold Frame

Do you find that plastic water bottles build up in your house or recycling bin? Well, save some, and you too can create this unusual, but effective cold frame! If you add a little silicone caulk between the bottles, you can make it completely enclosed, or you can leave the gaps to allow some vent space. Whichever you do, this reuse project makes the most of what would otherwise be landfill fodder or recycling plant materials.

 

Materials: Empty plastic bottles, wood doweling or slats, lumber, screws or nails, silicone caulk (optional)
Dimensions: Variable depending on size desired
Difficulty: Beginner to intermediate
Cost:

9.Hard Plastic, Acrylic, or Plexiglass Cold Frames

Quick ‘n Easy Cold Frame

This cold frame is a really interesting design. While not the least expensive option due to the polycarbonate panels used for the top of the frame, it’s definitely one of the longest-lasting options, and is resistant to tearing or breakage of the sunlight panel. This style will last for years and years of use!

 

 

Materials: Translucent polycarbonate panels and their fasteners, lumber, silicone caulking, hinges and misc screws
Dimensions: 8’ wide x 4’ deep x 1’ tall
Difficulty: Intermediate
Cost: $$$

 

10.Portable Cold Frame

If you don’t have raised beds, this cold frame might be a great option for you. Brick forms a flat support at the base and helps to keep the soil warmed by the sun. The box is inexpensive plywood, and the only expensive part is clear acrylic glazing panels which you can pick up at most big-box hardware stores. The acrylic resists ice buildup, which adds an extra layer of protection.

 

Materials: Acrylic glazing, plywood, bricks, screws, hinges
Dimensions: 61” wide x 37 ½” deep x 24” tall
Difficulty: Beginner to intermediate
Cost: $$

 

11.Plexiglass Cold Frame

This plexiglass-topped cold frame offers a rigid surface that will repel snow and rain, but which also will allow plenty of light through to the plants below. It’s not the cheapest option, but it’s one of the strongest on the list! You can also modify this to use an old door in lieu of the plexiglass if you’d like.

 

Materials: Plexiglass sheeting, lumber, hinges and assorted screws/tools
Dimensions: 6’ wide x 3’ deep, but can be variable if using old door instead of plexiglass
Difficulty: Beginner to intermediate
Cost: $$

 

12.Raised Bed Cold Frame

Designed to sit on top of a 4’x4’ raised bed, this cold frame is an easy build and works extremely well. The sloped lid provides rain runoff. Best of all, the whole thing can be lifted off the raised bed when the weather is warmer, as it’s fairly lightweight.

 

Materials: Lumber, acrylic sheets, screen door pneumatic closers, misc screws and hinges
Dimensions: Fits overtop a 4’ x 4’ raised bed
Difficulty: Beginner
Cost: $$

 

13.Dead Simple Cold Frame

As the name would imply, this cold frame is dead simple to build. The most complex part of the entire build is getting the angled top right. Otherwise, it’s something that can easily be knocked together in a couple hours’ time!

 

 

Materials: Lumber, greenhouse plastic, misc screws
Dimensions: 8’ wide x 4’ deep x 25” tall
Difficulty: Beginner
Cost: $$

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14.Glassless Cold Frame

On occasion, you can find old skylight domes that have been removed because they’ve started to leak at the sides. But these don’t have to be thrown away! Give them new life by using the dome as a top for a cold frame! A simple box base supports the skylight dome, allowing you to grow your plants right underneath.

 

Materials: Old skylight dome, lumber, screws
Dimensions: Depends on size of skylight dome
Difficulty: Beginner
Cost: $$

 

15.Cold Frame Table

This cold frame actually sits up above the ground, like a table, and is perfect for starting seeds in the winter! With a clear acrylic sheet on top, plenty of light hits the inside, and there’s a handy shelf underneath which provides a little extra storage space. Best of all, when it’s not in use as a cold frame, it can be repurposed as a handy potting table. The instructions are in a handy video format.

 

Materials: Clear sheet acrylic, lumber, screws or nails, hinges
Dimensions: 2’ wide x 3’ deep x 38” tall
Difficulty: Intermediate
Cost: $$

16.Glass Topped Cold Frames

Salvaged Window Cold Frame

If you’ve redone the windows in your house recently, or have a store locally who sells salvaged pane windows, this project is for you!

This makes a beautiful addition to the winter garden, and the panes of glass easily keep snow from reaching your fragile plants.

 

 

Materials: Salvaged window, lumber, misc bolts/hinges, tools
Dimensions: Variable, depends on size of salvaged window
Difficulty: Beginner to intermediate
Cost: $$

17.Old Window Cold Frame

Another idea using salvaged windows, this cold frame is built much taller, enabling it to be used for larger plants. The windows fold open from the center to the outsides, making it surprisingly easy to vent on a warmer day.

 

 

Materials: Salvaged window panes, lumber, misc bolts/hinges, tools
Dimensions: Variable, depends on size of salvaged windows
Difficulty: Beginner to intermediate
Cost: $$

18.Compact DIY Cold Frame

This smaller cold frame uses a single-pane reclaimed window as its top, and 2×6 boards to make up the sides. Thicker than most plywood frames, it does a really good job at keeping warmth inside!

 

 

Materials: Reclaimed window, lumber, hinges and misc screws
Dimensions: Depends on window, but example is 32”x32”
Difficulty: Beginner
Cost: $

19.Missouri Extension Cold Frame

Not only does this plan provide guidance in building a serviceable cold frame, but it teaches you how to build a “hotbed”, where more material (generally compost) is piled up around the sides of the cold frame to add extra insulation. Hotbeds are fantastic in very cold environments, as the warmth of the compost itself will keep the plants safer.

 

Materials: Glass sash, polyethylene or fiberglass for the top, lumber for the rest, needs hinges and assorted screws
Dimensions: 3’ wide by 6’ deep
Difficulty: Beginner
Cost: $$

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20.Vertical Cold Frame

This vertical cold frame is constructed almost completely of repurposed window frames, making it a great upcycling project as well! Built to rest against a wall, it is half-greenhouse, half-cold frame, and all very useful.

 

 

Materials: Reclaimed windows, lumber, misc hinges and screws
Dimensions: Variable depending on windows used
Difficulty: Intermediate
Cost: $

 

21.Pallet and Window Cold Frame

This upcycled pallet and window cold frame might be free, if you have a source of used pallets and windows! With a little ingenuity, you can have a very workable cold frame that will offer lots of protection to your plants for very little cash outlay.

 

 

 

Materials: Old pallets, reclaimed windows, nails or screws
Dimensions: Variable depending on parts available
Difficulty: Beginner
Cost: $

 

22.Brick and Window Cold Frame

Using cinderblocks or bricks and old windows, you can construct a cold frame that can easily be broken down into its component parts once the cold season is over, and stored away for future use. It’s nothing fancy, but protecting your plants does not have to be!

 

 

Materials: Cinderblocks or bricks, reclaimed windows
Dimensions: Variable depending on window size
Difficulty: Beginner
Cost: $

 

23.Hinged-Top Cold Frame

This great cold frame looks fantastic in the garden, and can be made using a wide variety of materials. While they used glass panels for theirs, you can do it with UV-resistant Lexan or plexiglass just as well. It does require a little more skill to build, but when it’s in place, it looks finished and clean.

 

Materials: Glass (alternately Lexan or plexiglass), lumber, dado set, screws or nails, hinges, misc other equipment
Dimensions: Variable, depends on size you need
Difficulty: Intermediate

So, if you want to have fresh lettuce or spinach all winter, would like to keep those flowers from freezing, or just want to experiment with early seed starting, there’s a cold frame here for everyone! Do you use a cold frame for winter gardening, and if so, did you build your own? Tell us all about your frame in the comments!

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