Western Giant Swallowtail (Heraclides rumiko) is in the Swallowtails and Parnassians family (Papilionidae). Across the U.S., iNaturalist users have logged 14,485 research-grade observations of it in our sample, peaking in September.
Seasonal pattern in the national data: summer visitor / breeder. Counts also reflect when people are out photographing, so compare months within a state rather than across states.
When to photograph Western Giant Swallowtail: observations by month (U.S.)
About Western Giant Swallowtail
Papilio rumiko is a species of swallowtail butterfly. It is found from the south-western United States, through Mexico, El Salvador, Honduras, Costa Rica to Panama. The northernmost record is north-eastern Colorado.From Wikipedia via iNaturalist — article, CC BY-SA.
Western Giant Swallowtail by state
| State | Observations | Peak month | Main season |
|---|---|---|---|
| California | 8,551 | September | Jul–Oct |
| Texas | 4,401 | October | Jul–Nov |
| Arizona | 1,480 | October | Aug–Oct |
| New Mexico | 41 | August | May–Sep |
| Colorado | 7 | August | Jul–Aug |
Main season = months with at least 30% of the state's peak-month count.
Related butterflies (Swallowtails and Parnassians)
Eastern Tiger Swallowtail
Pipevine Swallowtail
Black Swallowtail
Spicebush Swallowtail
Eastern Giant Swallowtail
Western Tiger Swallowtail
Zebra Swallowtail
Anise Swallowtail
Photography tips
- Butterflies are sluggish on cool mornings — the best time for close approaches.
- Keep the sensor parallel to the wings for edge-to-edge sharpness.
- Nectar plants in bloom are reliable places to wait.
FAQ
When is the best time to photograph Western Giant Swallowtail?
Nationally, September has the most observations, with the main season from June to November.
Where is Western Giant Swallowtail most often seen?
The most observations come from California, Texas, Arizona.