When I lived in South Africa we grew the above during winter, along with peas and broad beans. Those were our "winter veg". Snow though… whee… that puts a different spin on things. You should ask in our sister forum, TheEasyGarden.com, and see what the members over there suggest for growing as...
Kale is fairly tough and depending on your winter temperatures, broccoli (feed the leaves), cauliflowers (feed the leaves), cabbage can be grown in the colder months.