A variety of lettuces such as head and leaf types are able to be grown year-round, given the proper precautions, as will spinach. Water, garden and land cress may also be planted all year. Kale and cabbage are good choices, as are collard greens which tolerate frost well. These vegetables are all able to be grown during cold times frames, if necessary, which make them easy to harvest during the winter months. If it snows in your area, sweep the snow away from the frame.
These foods will provide you with salads throughout the cooler months. They will be welcome additions to sandwiches and boiled dinners. Go out and pick your salad fixings for fresh eating even in cold weather.