Mexican Yellow (Eurema mexicana) is in the Whites, Yellows, and Sulphurs family (Pieridae). Across the U.S., iNaturalist users have logged 2,035 research-grade observations of it in our sample, peaking in October.
Seasonal pattern in the national data: seasonal. Counts also reflect when people are out photographing, so compare months within a state rather than across states.
When to photograph Mexican Yellow: observations by month (U.S.)
About Mexican Yellow
Eurema mexicana, the Mexican yellow, sometimes called the wolf-face sulphur, is a North and South American butterfly in the family Pieridae. It occurs mainly in Mexico but occasionally is found in central and southwestern United States and rarely in Canada.From Wikipedia via iNaturalist — article, CC BY-SA.
Mexican Yellow by state
| State | Observations | Peak month | Main season |
|---|---|---|---|
| Arizona | 1,126 | October | May–Dec |
| Texas | 660 | November | Oct–Dec |
| New Mexico | 135 | October | Sep–Dec |
| Oklahoma | 59 | June | Jun–Jul |
| California | 21 | October | Oct–Oct |
| Colorado | 18 | July | Jun–Jul |
| Arkansas | 6 | November | Nov–Dec |
Main season = months with at least 30% of the state's peak-month count.
Related butterflies (Whites, Yellows, and Sulphurs)
Small White
Orange Sulphur
Cloudless Sulphur
Sleepy Orange
Checkered White
Dainty Sulphur
Little Yellow
Clouded Sulphur
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 Mexican Yellow?
Nationally, October has the most observations, with the main season from May to December.
Where is Mexican Yellow most often seen?
The most observations come from Arizona, Texas, New Mexico.