The best cold frames I have seen were made out of recycled materials, found around the yard/house or in the woods. And usually when making cold frames out of recycled materials, this requires minimal materials, less work, and usually no power tools.
Most often I see the top of the cold frame made out of recycled windows or doors. Actually I use recycled glass shelves from an old refrigerator to protect the greens growing in buckets (here). The frame can be made out of recycled pallets/pre-cut wood, sticks/branches/logs, bricks, stones, cinder blocks, straw bale, and much more.
Here I show you the cold frame ideas made out of recycled materials, or minimal materials.
|High mowing seeds|
|Spotts Garden Service|
Lastly, an important tip in making the cold frames: angle the cold frame so that it faces south, and the glass is 39 degrees from the back wall (which should be taller than than parallel wall.