Just built two of these cold frames from some old recycled material I had laying around. They measure 2feet by 4 feet. Gonna try them out this weekend probably for some spinach,broccoli, cabbage , onion.
I have lots more windows and sliding doors. If I have good luck,I'll be a large one or two for over winter greens:) Seasons are too short here in Maine!!!!

Don't know how they would work for over winter but I have one started this Spring and I put in lettuce plants and radishes and put mater seeds in the 4 pk to get them started..Got onion plants yesterday and am thinking to put some of those in there...Told H I need a bigger one..Mine is a long one but not big enough....hahaha

Be careful, Cold frame is how I started...

They are great for getting an early start and hardening off stuff.

yah, these are small ones to help get the hardier seedlings out of the house I plan on making larger ones with the sliding glass doors for my winter crop. I'll fill the big ones with compost and manure, to get a nice crop of spinach, mache, carrots and onions....n maybe some other things too My family has been complaining all winter about not having any salad from the garden
today it was 60*F out veggie gardening is around the corner!!!!!!

I always loved having a cold frame to get a jump on things. I always wanted automatic openers though, I would forget a lot to open them. Good thing my DH was retired so he could do it for me.