The cold frame is the place for my baby lettuces, and a couple of overwintered spinaches and one big head of lettuce. To keep cats and rabbits and other rascals out of them, we exclude them with a pair of screens made of wire fencing.
This big juicy butter head lettuce that overwintered has been feeding us salad already. Pat told me I can let it flower and seed, because lettuces are open pollinated and the seeds should be true to the parent. I think that's what she told me, I should look it up, too.
And hardening off the basils, peppers, celosias, and some various other herbs.