While winter storage radish varieties are still on store shelves, spring varieties are available fresh starting in March.
Although prime rhubarb season runs from April through June, some harvests hit the shelves in late March. Washington, Oregon, and California are the main producers of rhubarb nationwide.
Spinach is grown year-round in California–the largest spinach producing state in the U.S–with other major producers being Arizona, New Jersey, and Texas.
Chard, a cool weather green, grows year-round in many areas, including California.
Turnips are generally in season from October through March. Although they can be grown year-round, they are freshest in the fall and spring.