You could try it, but I would put some plastic gallon jugs in with the
seedlings. When the sun shines on the jugs, it will warm them up and keep
the seedlings warm during the night. You could paint them balck or dark
green to get more heat out of them. How warm, I have no idea. That will
depend on the size of the bed and area to be kept above freezing.

Dwayne


"Pammy" wrote in message
om...
I'm new to using Newsgroups. I'm a vegetable and flower gardener in
Massachusetts (near New Hampshire border). I would like to get a
jumpstart on growing some lettuce. I've read that I can make a simple
cold frame from an old window frame supported over the ground with hay
bails. I would like to know if anyone has tried this and might anyone
have some growing suggestions?