The Cloudless Sulphur is a large, brilliant lemon-yellow butterfly that makes notable fall migrations along the Atlantic and Gulf coasts. Males are unmarked bright yellow above, while females have scalloped black borders. Its fast, direct flight and preference for tubular red and orange flowers make it conspicuous in gardens and open habitats.
Best time to see a Cloudless Sulphur
The best time to see a Cloudless Sulphur is August–October, when about 67% of U.S. sightings happen, based on 35,808 research-grade iNaturalist observations.
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