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How to Build a Cold Frame

The window frame top of a cold frame opens slightly to show the plants inside.

Last updated September 7, 2023

You can extend the growing season in your garden with a cold frame. Think of a cold frame as a simple greenhouse that sits close to the ground. To allow light in, the top of the cold frame may be made of glass, fiberglass or plastic. The cold frame helps to hold the sun’s warmth overnight, shielding plants from frost and freezing temperatures.

This guide will show you how to build a cold frame with wood and plastic sheeting.

Difficulty:

Intermediate

Duration:

2-4 hours

Project Guide
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Table of Contents

  1. Gather Tools & Materials

  2. Cut the Wood

  3. Make the Base of the Cold Frame

  4. Cut the Wedges

  5. Attach the Wedges

  6. Lay Out and Measure the Top of the Cold Frame