I have a hub on the Monach Butterflies we get in our yard. They come here to this area (Wis) lay ttheir eggs and head to California and Mexico. My hub is The Bluebirds And The Monarch Butterflies Have Come Home.
Monarch Butterflies at least some of them winter over in Florida.
Because of the warm climate and continuous availability of host plants, much of Florida's monarch population stays in the state year-round and breeds continuously throughout the year. Year-round residents are more common in southern Florida, as cold winter temperatures in northern Florida can kill monarchs at any life stage. In addition to resident populations, the state also hosts migratory monarchs from northeastern North America, but there are competing hypotheses regarding how these migrants travel to, from, or through Florida.