In the proper season of the year, it can be grown with fair success in most areas of the country. In mild areas, or where there is deep snow cover, the sprouts may overwinter.
Sprouts improve in quality and grow best during cool or even lightly frosty weather.
Brussels sprouts require a long growing period, though newer hybrids have greatly reduced this requirement. In all but the most northern states, summers are usually too warm for completely satisfactory production from spring plantings. Plants set out in late spring to early summer grow satisfactorily and mature high-quality sprouts when the fall weather begins to cool. Transplant in early summer to midsummer about the same time that you would plant late, long-season cabbage. For summer harvest, you must plant transplants of an early, heat-resistant variety in very early spring.