Freeze warning - vegetables in planters

Northern Illinois - after only the lightest of frosts, a real freeze is coming this weekend. I have a lot of hardy vegetables and I’m not worried about the ones in ground, but I also have a grow bag with carrots, and a huge (VegTrug) elevated planter stuffed with kale, lettuce, escarole, celery, and herbs (rosemary, thyme, parsley). Lows will be 27-28 two nights in a row, with highs around 37-38. Should I harvest anything/everything?