Keep your eyes open for Cloudless sulphur butterflies! Monarchs aren’t the only ones migrating this time of year. Fall is a wonderful time to see the Cloudless sulphurs in flight on their southern migration. The Cloudless sulphur can be found year-round in the southern United States, Caribbean and much of South America, but migrating populations extend all the way to Colorado, New Jersey or even Canada during the summer months. Cloudless sulphurs practice a large fall migration to southern regions, much like the Monarch butterfly.