Like CQ I try and make sure that I have fresh salad leaves all year round, and carefully plan when to sow those precious crops for late spring harvests.
I find I can leave carrots and beet in the ground with a decent covering of straw if it is going to be a deep freeze (plus a few slug pellets just to be on the safe side) and they keep better than in a clamp.
The old stalwarts of PSB, leek, sprouts, spring greens and kale (plus parsnips of course
) together with chard mainly keep us going, with stored potatoes, onions and squashes, dried beans and stuff from the freezer and preserve jars.
Tends to get a bit thin around early May though, and I found my attempt at very early carrots undercover was dismal, although radishes were worthwhile.