How to Build a Cold Frame

Follow these easy steps to extend your garden's growing season.

| April 2016

In Garden Projects: 25 Easy-to-Build Wood Structures and Ornaments (The Countryman Press, 2015), Roger Marshall provides step-by-step instructions on how to create a variety of simple DIY additions to any outdoor space. Use these project ideas to add a practical, aesthetic element to your backyard or to improve your garden production. Marshall has years of construction experience, and has developed projects that can easily be completed using materials from any local hardware store.

You can purchase this book from the GRIT store: Garden Projects.

Building a Cold Frame

A few years ago, I was given five wood-framed storm windows, each 30" wide, and decided that they would make a great cold frame for my garden. As the growing beds were already 4 feet wide and the windows were 5 feet long, the cold frame’s back height of 3 feet was simple to calculate (3-4-5 triangle). I built two triangular ends and a rear section and screwed the three parts together easily, after which the storm windows were simply set in place.


• Handsaw or rotary saw
• Screwdriver or hammer
• Tape measure


• Two 4-inch x 4inch x 4-foot pressure-treated posts for the back corners

For the ends:

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