Leave the green beans for seed harvesting on the plant until the pods begins to turn brown.
Remove the pods from the plants.
Spread the pods on a large screen and place it outside to dry. Keep the pods in a dry, warm and protected outside area for about two weeks.
Remove the beans from the pods or leave the beans in the pods until you are ready to plant. Store seeds or pods in an airtight glass container in a cool and dry location. Ideal storage temperatures are between 32 degrees and 41 degrees Fahrenheit.