soil temp for planting soybeans beans
Soybeans have a harder time sprouting than other beans. Plant your Soybeans outdoors directly in the garden, 14 days after your last frost date, and when night time temperatures are 75 F and soil temperature is 65 F. Use black plastic to warm the soil a few weeks in advance of planting seeds.Soybeans do not like soil that is too moist. Plants can grow 12 to 24 tall.lant your Soybeans outdoors directly in the garden, 14 days after your last frost date, and when night time temperatures are 75 F and soil temperature is 65 F. Use black plastic to warm the soil a few weeks in advance of planting seeds. Soybeans do not like soil that is too moist.