9/14/2026
Grow Greens Past the First Frost: A Plain Guide to Cold Frames
A cold frame is the simplest season extender there is: a low box with a translucent lid that traps heat and keeps wind and frost off hardy greens. This plain guide covers how it works, how to build one from an old window and scrap wood, how to keep it from cooking your plants, and which crops are worth growing into winter.