Bronze Copper (Tharsalea hyllus) is in the Gossamer-winged Butterflies family (Lycaenidae). Across the U.S., iNaturalist users have logged 3,325 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 Bronze Copper: observations by month (U.S.)
About Bronze Copper
Lycaena hyllus, the bronze copper, is a butterfly of the lycaenids family found in North America.From Wikipedia via iNaturalist — article, CC BY-SA.
Bronze Copper by state
| State | Observations | Peak month | Main season |
|---|---|---|---|
| Ohio | 1,052 | September | Jun–Oct |
| Illinois | 289 | August | Jun–Sep |
| Michigan | 251 | August | Jun–Sep |
| New York | 245 | June | Jun–Oct |
| Wisconsin | 245 | August | Jun–Sep |
| Vermont | 167 | June | Jun–Sep |
| Minnesota | 155 | June | Jun–Sep |
| Pennsylvania | 132 | September | Jun–Oct |
| Massachusetts | 131 | September | Sep–Oct |
| Missouri | 116 | July | May–Oct |
| Indiana | 78 | July | May–Oct |
| Iowa | 73 | July | May–Sep |
| Colorado | 61 | September | Jun–Sep |
| Maine | 46 | June | Jun–Sep |
| Delaware | 45 | July | May–Jul |
| Connecticut | 36 | June | Jun–Jun |
| Maryland | 36 | July | May–Oct |
| North Dakota | 24 | August | Jun–Aug |
| Nebraska | 20 | June | Jun–Sep |
| South Dakota | 19 | August | Jun–Aug |
| Tennessee | 19 | June | Jun–Jul |
| Kentucky | 17 | July | Jun–Aug |
| Kansas | 16 | July | Jun–Oct |
| New Jersey | 15 | July | Jun–Aug |
| Utah | 12 | July | Jun–Aug |
| West Virginia | 6 | May | May–May |
| New Hampshire | 5 | June | Jun–Jul |
Main season = months with at least 30% of the state's peak-month count.
Related butterflies (Gossamer-winged Butterflies)
Gray Hairstreak
Eastern Tailed-Blue
Red-banded Hairstreak
Marine Blue
Ceraunus Blue
Summer Azure
Western Pygmy-Blue
Reakirt's Blue
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 Bronze Copper?
Nationally, September has the most observations, with the main season from June to October.
Where is Bronze Copper most often seen?
The most observations come from Ohio, Illinois, Michigan.