Keep it at-10 degrees for 2 weeks. If the temperature rises or falls to a lower level on a certain day during the period, it does not meet the requirements. At the same time, it needs to be kept at-10 degrees for manual picking. Generally, a vine can brew 1 bottle of 375 ml ice wine at most. It is necessary to ensure that the fruit will not be eaten by birds when it is ripe, and that the grapes will not fall down because of freezing. Picking is basically done manually at night, so the cost will be great. After picking it back, juice it and then ferment it.