Green beans are warm soil crops, so never sow the seeds before the soil temperature is near 70 degrees or warmer. Try bush beans to start, as IMO they are easier to get a quick reliable crop.
Sweet peas are very cool soil crops. Plant those seeds in the very early spring, at least six weeks prior to the last frost date. The peas will do well until the temperatures start hitting in the 80's and then the vines will begin to turn brown and die. I just pulled my up and moved them to the compost pile today, but we had several weeks of very sweet sugar snaps.
Eclectic gardening style, drawing from 45 years of interest and experience. Mostly plant in raised beds and containers primarily using intensive gardening techniques.