Chop celery into chunks, and place the celery pieces inside freezer bags or containers before storing them in the freezer. To prevent the celery pieces from sticking together, spread them out on a tray, and freeze them in that arrangement before putting them into the bags or containers.
Freeze roughly chopped celery in muffin tins to make frozen celery disks, or freeze finely chopped celery in ice cube trays to make frozen celery cubes. Frozen raw celery keeps well in the freezer for a few months. Blanch the celery chunks in boiling water for approximately three minutes before freezing them to preserve their quality for up to a year. Alternatively, fry celery pieces in oil before storing them in the freezer. Frozen celery does not stay crunchy, making it unsuitable to use in dishes such as salads.