20 DIY Cold Frame Plans For Your Winter Garden
Do you want to keep gardening, even in the middle of winter? In this article, Kevin Espiritu shares 20 DIY cold-frame plans for your garden.
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As the cold weather starts to come on, many of us sigh and look forward to the start of 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 are many cold-weather vegetables that can easily grow with just a little protection. And building a DIY cold frame is the perfect solution.
While a DIY 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 cold frame 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!
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Plastic Sheeting/Soft Plastic Cold Frames
Simple Cold Frame
This particular DIY 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 cold frame crops 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: | $$ |
PVC Cold Frame
Constructed entirely of PVC and plastic sheeting, this basic PVC frame keeps warmth inside and allows ease of access through its triangular hinged roof. The plastic sheeting can be easily replaced year after year as needed as you practice cold frame gardening.
| Materials: | PVC and PVC connectors, 6mil clear plastic sheeting, pipe glue |
| Dimensions: | 4’ wide x 2’ 4” deep |
| Difficulty: | Beginner |
| Cost: | $ |
Cold Frame Tent
If you have existing raised beds, all you need is the top for this to rest on top of your beds. If you don’t, add a box around your garden plot, and with very little difficulty, you are set up to endure the weather while still growing plants to a reasonable height!
| Materials: | Heavy plastic sheeting, lumber, a hardwood dowel, screws or nails |
| Dimensions: | Variable depending on need |
| Difficulty: | Beginner to intermediate |
| Cost: | $-$$ |
Sleek & Efficient Cold Frame
This functional DIY cold frame is intended to be constructed for an already-existing raised bed. While a slight variation to the design would enable runoff from rain to move more easily, it’s a great option for people in cold but dryer 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: | $ |
PVC Cold Frame Hoop House
This arched hoop house-style DIY 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. This one is basically a mini greenhouse that makes gardening in the winter growing season possible.
| 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: | $-$$ |
Amish Cold Frame
This one does not come with an exact cold frame plan, so it takes a little bit of plotting to recreate it. However, it’s a simple enough structure. It’s adorably cute, as it looks like a mini greenhouse, and it’s incredibly useful for cold frame gardening, as only half the lid needs to be lifted to access the plants inside or to provide ventilation.
| Materials: | Lumber, plastic sheeting, hinges, nails or screws, and a chain with a spring for each end |
| Dimensions: | 66” long x 24” wide |
| Difficulty: | Intermediate |
| Cost: | $$ |
Plastic Bottle Cold Frame
Do you find that plastic bottles build up in your house or recycling bin? Well, save some, and you too can create this unusual but effective DIY 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 material.
| 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: | $ |
Hard Plastic, Acrylic, or Plexiglass Cold Frames
Portable Cold Frame
If you don’t have raised beds, this DIY 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: | $$ |
Raised Bed Cold Frame
Designed to sit on top of a 4’x4’ raised bed, this DIY cold frame is an easy build and works extremely well. The sloped lid provides rain runoff. Best of all, the whole thing can be lifted off the raised bed when the weather is warmer, as it’s a fairly lightweight cold frame.
| Materials: | Lumber, acrylic sheets, screen door pneumatic closers, misc screws and hinges |
| Dimensions: | Fits overtop a 4’ x 4’ raised bed |
| Difficulty: | Beginner |
| Cost: | $$ |
Dead Simple Cold Frame
As the name would imply, this DIY 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: | $$ |
Glassless Cold Frame
On occasion, you can find old skylight domes that have been removed because they’ve started to leak at the sides. But these don’t have to be thrown away! Give them new life by using the dome as a top for a DIY cold frame! A simple box base supports the skylight dome, allowing you to grow your plants right underneath.
| Materials: | Old skylight dome, lumber, screws |
| Dimensions: | Depends on size of skylight dome |
| Difficulty: | Beginner |
| Cost: | $$ |
Cold Frame Table
This DIY 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: | $$ |
Glass Topped Cold Frames
Salvaged Window Cold Frame
If you’ve redone the windows in your house recently or have a store locally that sells salvaged pane windows, this project is for you! This makes a beautiful addition to the winter garden, and the panes of glass easily keep snow from reaching your fragile plants.
| Materials: | Salvaged window, lumber, misc bolts/hinges, tools |
| Dimensions: | Variable, depends on size of salvaged window |
| Difficulty: | Beginner to intermediate |
| Cost: | $$ |
Old Window Cold Frame
Another idea using salvaged windows, this DIY 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: | $$ |
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 of keeping warmth inside!
| Materials: | Reclaimed window, lumber, hinges and misc screws |
| Dimensions: | Depends on window, but example is 32”x32” |
| Difficulty: | Beginner |
| Cost: | $ |
30 Minute Cold Frame
Straw bales and old windows? Absolutely! This technique is not glamorous, but it is fast, warm, and functional. If you’ve got straw bales lying around, along with some large old windows, you can have one of these assembled in no time at all.
| Materials: | Straw bales, large reclaimed windows |
| Dimensions: | Varies depending on bale count and size of windows |
| Difficulty: | Beginner |
| Cost: | $ |
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: | $ |
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: | $ |
Brick Cold Frame
This cold frame is a permanent structure, as the bricks are mortared together. However, the lid can always be lifted if the weather gets too warm. If you live in an area that has a short growing season, this might be perfect for you!
| Materials: | Bricks, mortar, window panels or lumber and plexiglass, screws and hinges |
| Dimensions: | Variable |
| Difficulty: | Intermediate to difficult |
| Cost: | $$-$$$ |
Shower Door Cold Frame
You can use a repurposed glass shower door for this project, or if you can’t find one of those, use old window panes. An easy step-by-step video shows you the process, and it’s a quick and easy cold frame build.
| Materials: | Old glass shower door or windows, lumber, screws, hinges |
| Dimensions: | Varies depending on size of top |
| Difficulty: | Beginner |
| Cost: | $$ |
Frequently Asked Questions
Q: How deep does a cold frame need to be?
A: Slightly smaller than the depth of a raised bed is how deep your cold frame should be. At least half a foot of space is good.
Q: What kind of wood should I use for a cold frame?
A: You want a durable hardwood so your cold frame will last more than just a couple of seasons.
Q: What is the ideal size for a cold frame?
A: You want at least a few feet of width to work with.
Q: How do you make a simple cold frame?
A: There are so many ways! Check the cold frame plan list above to see how you can fashion your own.
Q: What is the best slope for a cold frame?
A: When you’re building from the above cold frame plan list, use an angle that’s at least 15° and up to 35°.
Q: Should a cold frame be in sun or shade?
A: You want plenty of warmth circulating through your cold frame. Full sun, therefore, is a must.
Q: Does a cold frame need a bottom?
A: Not necessarily, especially if it’s going to go over a raised bed!
Q: Does a cold frame need to be sealed?
A: While you will still generate warmth without a seal, a seal will keep the warmth trapped inside the frame.
