At 3,000 feet in AZ we get mildly freezing nights and above-freezing days in the winter. So my garden is full of winter hardy plants that keep growing and doing their thing.
I am surprised the lettuce is doing so well! Also my herbs. The carrots and potatoes are slow growing but hanging in there. My fruits trees are actually setting buds.
I keep thinking of planting radishes just to see what happens. They like the cold and are mostly protected by being root crops. And speaking of which, the garlic and onions seem to be quite happy and snug!