Planting Dates for Soybeans

Ground Temperature

• The National Soybean Research Laboratory reports that soybeans planted during the month of May possess the best likelihood of enhanced yield. Regardless of the planting date, it is vital that the temperature of the soil stand at a minimum of 55 to 60 degrees Fahrenheit for proper germination.

Types

• Soybeans require warm weather and between three and five months to garner maturity. Overall development will be slower in cooler climates. Varieties that mature early should be planted in northern growing regions, while growers in warmer, southern sections should utilize soybean types of medium or late maturity.

Growing Regions

• Generally speaking, soybeans may be planted at approximately the same time as other, warm-weather, extended-season plants like tomatoes. Soybean varieties are grouped into 13 maturity levels; these groups are given assigned numbers -- dependent on climate and latitude -- and designated for planting in specific regions throughout Canada and the United States.