I sow beans when I plant my annuals in the ground. Usually around the third week of May. Peas are a bit hardier and cold resistant. As an added 'precaution' to having beans rot in cool ground, the ground should not be cold to the touch. It should be warm, or at least warm enough that you wouldn't mind 'squishing' the soil with your hands.
I usually soak beans for one day in a small cup, drain the water, and cover the top with a piece of wet paper towel. Leave it somewhere where you won't forget about it. Rinse the beans once a day and cover container with a moistened paper towel after each rinse. In 3-4 days, you'll see a small root coming out of the bean. You should get a better survival rate planting these pre-germinated beans. The roots can immediately start absorbing some water in the ground. Plant the beans as deep as the packet says, water, and place the top half of a water bottle over the ground where the
seed is. You shouldn't need to water until a sprout pokes out of the ground, unless the ground is REALLY dry.