Overwintering Cauli seedlings

in Fruit & veg
I sowed some cauliflower seeds in Sept/Oct as it said on the packet, and when they germinated (quite quickly) I pricked them out into 4 inch pots. Now they are about six inches tall. The instructions said to overwinter them in a cold frame, for which purpose I'm using an unheated greenhouse, but I see that some of them have a whole bunch of roots poking through the bottom of the pots. I'm wondering whether to pot them up to bigger pots, or to take a chance and plant them out under fleecy cloches. Any suggestions?
PS, we live on the south coast where the winters are not particularly harsh.
Last edited: 27 October 2017 09:06:11
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I presume they're 'summer' cauliflowers ... in which case I'd pot them on but keep them in the greenhouse until spring. The mild autumn has got quite a few plants carrying on growing late into the season.
Thanks. I'll maybe plant a couple out just as an experiment and pot the rest on.