Start Back Next Photo: Operation Migration When Will They Leave? It’s October. The leaves in central Wisconsin are changing color. Mornings are foggy. Days are shorter. Nights are cooler. The older “ultra-whoopers” summering in Wisconsin are getting restless. It’s almost time to migrate to their winter home in Florida. The target departure date is set for the ultralights and colts. It is the date when the crew and equipment are all in place. Each of the 38 potential migration host sites has been checked. But weather will be the deciding factor. What kind of weather do they need?