There is a stamped manufacture date code on the product that is five digits ? for example 17114, the first two numbers are the year (2017) and the last three are the Julian date (114th day of the year ? April 24). ↑ What is the shelf life of Wilton cookie icing?Ģ4 months A: Cookie Icing is freshest if used within 24 months. You can store your decorated cookies in an airtight container at room temperature for about three days. Is it OK to bend after embryo transfer? ↑ Does Wilton decorating icing need to be refrigerated?ĭO NOT refrigerate or freeze leftover fondant. There is a stamped manufacture date code on the product that is five digits - for example 17114, the first two numbers are the year (2017) and the last three are the Julian date (114th day of the year - April 24). Icing Tubes are freshest if used within 12 months. ↑ How long do Wilton Icing Decorations last?