
Arizona Sister (Adelpha eulalia) is in the Brush-footed Butterflies family (Nymphalidae). Across the U.S., iNaturalist users have logged 4,377 research-grade observations of it in our sample, peaking in August.
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 Arizona Sister: observations by month (U.S.)
About Arizona Sister
Adelpha eulalia, the Arizona sister, is a species of butterfly in the family Nymphalidae. It is occurs from at least Guatemala and Mexico to the southwestern United States, including southeastern California, Arizona, New Mexico, southern Texas. They can also sometimes be found in Oklahoma, Kansas, Colorado, Utah, and Nevada. Adelpha eulalia belongs to the serpa species group in the genus Adelpha (sisters). It was previously treated as a subspecies of Bredow's sister (Adelpha bredowii). Recent phylogenetic...From Wikipedia via iNaturalist — article, CC BY-SA.
Arizona Sister by state
| State | Observations | Peak month | Main season |
|---|---|---|---|
| Arizona | 2,530 | August | May–Oct |
| New Mexico | 626 | August | May–Sep |
| Texas | 598 | August | Apr–Nov |
| Utah | 423 | September | Aug–Oct |
| Nevada | 174 | September | Aug–Oct |
| Colorado | 24 | September | Aug–Sep |
Main season = months with at least 30% of the state's peak-month count.
Related butterflies (Brush-footed Butterflies)

Monarch

Gulf Fritillary

Common Buckeye

Red Admiral

Pearl Crescent

Painted Lady

American Lady

Variegated Fritillary
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 Arizona Sister?
Nationally, August has the most observations, with the main season from May to October.
Where is Arizona Sister most often seen?
The most observations come from Arizona, New Mexico, Texas.