Based on 4,708 research-grade iNaturalist observations in Texas, Eastern Giant Swallowtail is most often recorded in September; in Texas it behaves like a summer visitor / breeder. It ranks #45 among butterflies recorded in the state in our data.
Heraclides cresphontes
Eastern Giant Swallowtail in Texas by month
Bars show research-grade observations per month. They mix true seasonality with how often people are outdoors, so treat small numbers with caution.
Also seen in Texas in September
Gulf Fritillary
Monarch
Queen
Pipevine Swallowtail
Fiery Skipper
Hackberry Emperor
Gray Hairstreak
Painted Lady
Places to look in Texas
State ParkDinosaur Valley State Park
Botanical GardenSan Antonio Botanical Garden
State ParkGarner State Park
State ParkBrazos Bend State Park
State ParkPedernales Falls State Park
State ParkEnchanted Rock State Natural Area
FAQ
When does Eastern Giant Swallowtail appear in Texas?
Mainly April–October, with the most records in September.
How common is Eastern Giant Swallowtail in Texas?
It ranks #45 by number of iNaturalist observations among butterflies in Texas (4,708 records in our sample).