Place them in the freezer bag, get as much as possible of the freezer bag.
Store in the freezer for up to 4 months.
Defrost in the refrigerator or at room temperature when ready to use.
Notes
You can also freeze lemon in slices to keep on hand for drinks or meals. Cut the lemons into wedges. Place the wedges on a baking sheet and freeze for at least 1 hour. Then transfer the lemon slices to a freezer bag, remove as much air as possible and freeze. Defrost in the refrigerator or at room temperature.