Soybeans are slower growing than most garden beans, requiring warmer weather and about 3 to 5 months for maturity. In cooler growing regions, the rate of development will be slower. Only the early maturing varieties should be grown in the northern growing regions, and the medium or late maturing varieties grown in the south regions. Planting soybeans can be done about the same time as tomatoes and other long-season, warm-weather crops are put in the garden.