Cold Frame  @Circadea

Hinges Strap Hinges
Screws  
Boards
Coldl Frame should always be open 1 inch vent except for harsh frost.
Cold Frame 2 month jump on season.
Eat from during winter.
Hoop type better air better growing.
Poly vs Cold vs
Bamboo Fleece Row Covers
Hoop House 3 months