How to Build a Simple Cold Frame and Extend Your Growing Season
📌 TL;DR: Cold Frame Key Takeaways: A cold frame is a bottomless box with a transparent lid that traps heat and protects plants from frost. Build one in an afternoon for $0–$60 using salvaged lumber and an old storm window. Extends the growing season 2–4 weeks on each end (spring and fall), per Iowa State…
