I don't recommended freezing salad. The freezing process damages the texture and flavor of the ingredients, making them less palatable. The high water content in salad ingredients like lettuce and cucumbers can also cause them to become mushy when frozen and then thawed. However, some salad ingredients can be frozen separately and used in other dishes. For example, cooked beans or grains like quinoa or rice can be frozen and added to salads later on. You can also freeze salad dressings in an airtight container, but they may need to be whisked or blended again after thawing to restore their texture.