Here in zone 7b , I start some plant seeds starting in January, like cardoon and artichokes. Lettuces, green onions, broccoli and etc. , for early starts, indoors, for transplanting outdoors, under covers and then slow developing plants like peppers and similar the middle of February or the first of March and tomatoes and such in mid March. The main summer gardens start getting planted in late April and early May. In fact there are no months I am not starting some seeds or bulbs/cuttings , etc. Most winters I can grow some limited crops all winter long under row covers or over winter some crops that are perennials or that I wish to bring to seed in the spring. Rare very cold temps can freeze my winter garden out some years, despite my row covers. Gardening is year round here for me and on the cold wet winter days I spend shelling last years peas, grinding corn meal and planning next years efforts. Best wishes and Merry Christmas to all!