The cowpea is a warm-weather legume

The cowpea is a warm-weather legume

The cowpea is a warm-weather legume. In the United States it succeeds best in the south and southwest. It has, however, in recent years been grown as far north as Massachusetts, New York, Ohio, Michigan, and Minnesota, but in these cold climates other legumes are more useful. Cowpeas should never be planted until all danger of frost is past. Some varieties make their full growth in two months; others need four months.

Source: Agriculture for Beginners