In Ontario, ice wine must be made as a varietal wine and the grapes must be picked at -8 degrees C or colder! Artificial freezing is forbidden. Grapes must be harvested at a Brix (sugar) level of at least 32 in order to achieve Icewine designation. A high quality Icewine will measure 40 - 42 Brix and these levels usually dictate the price of Icewine. From Bouquet du Vin.