Wash the green beans thoroughly under cold water and trim off the ends.
If desired, cut the beans into bite-sized pieces.
Bring a large pot of water to a boil and add the green beans.
Blanch the beans in the boiling water for about 3 minutes.
While the beans are blanching, prepare an ice bath in a large bowl or sink by filling it with cold water and ice cubes.
Using a slotted spoon or tongs, transfer the blanched beans to the ice bath and let them sit for another 3 minutes.
Remove the beans from the ice bath and pat them dry with a clean kitchen towel or paper towels.
Arrange the beans in a single layer on a baking sheet.
Place the baking sheet in the freezer and freeze the beans for about 2 hours or until they are completely frozen.
Once frozen, transfer the green beans to freezer bags or airtight containers.
Squeeze out as much air as possible before sealing the bags or containers.
Label the bags or containers with the date of freezing.
Return the green beans to the freezer for long-term storage.