This is the happy medium between frost protection and a greenhouse. These low to the ground enclosures make perfect microclimates to protect plants from cold weather. One of the advantages of using a cold frame is that you can raise a huge variety of crops from seed through to maturity within the frame, so you can have your favorite vegetables ahead of their normal season when they are expensive to buy. Easy to assemble and use, consider one of these to get an early start on your growing season or extending it a few extra weeks.