Rinsed green beans under cool running water in a colander.
Trim the tops off the green beans using a sharp knife with a single slice when lining a few beans up green beans. Cut green beans in halves, thirds, or leave whole.
Bring a pot of water to a boil. Add the green beans to it. For a bright green and barely tender bean, boil them for 3 minutes. Meanwhile, put ice in a bowl for a water bath.
Remove green beans, and then plunge them in the ice bath. Drain the beans and pat them dry with a kitchen towel or paper towels once cooled completely.
On a parchment-lined baking sheet, place the green beans in a single layer.
After the beans have been frozen, transfer them to a freezer bag and store them in the freezer for up to three months.