60 butterflies were recorded flying in Pennsylvania in June in our iNaturalist sample; 9 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top butterflies in June

Great Spangled Fritillary

Small White

Silver-spotted Skipper

Little Wood Satyr

Eastern Tiger Swallowtail

Red Admiral

Monarch

Black Swallowtail

Summer Azure

Zabulon Skipper

Spicebush Swallowtail

Little Glassywing
All butterflies flying in Pennsylvania in June
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Great Spangled Fritillary | Argynnis cybele | Brush-footed Butterflies | 1,298 | Jul (rising) |
| 2 | Small White | Pieris rapae | Whites, Yellows, and Sulphurs | 1,087 | Jul (rising) |
| 3 | Silver-spotted Skipper | Epargyreus clarus | Skippers | 907 | Aug (rising) |
| 4 | Little Wood Satyr | Megisto cymela | Brush-footed Butterflies | 770 | Jun (peak) |
| 5 | Eastern Tiger Swallowtail | Papilio glaucus | Swallowtails and Parnassians | 721 | Jul (rising) |
| 6 | Red Admiral | Vanessa atalanta | Brush-footed Butterflies | 707 | Jul (rising) |
| 7 | Monarch | Danaus plexippus | Brush-footed Butterflies | 606 | Aug (rising) |
| 8 | Black Swallowtail | Papilio polyxenes | Swallowtails and Parnassians | 528 | Aug (rising) |
| 9 | Summer Azure | Celastrina neglecta | Gossamer-winged Butterflies | 459 | Jul (rising) |
| 10 | Zabulon Skipper | Lon zabulon | Skippers | 423 | Aug (rising) |
| 11 | Spicebush Swallowtail | Papilio troilus | Swallowtails and Parnassians | 422 | Aug (rising) |
| 12 | Little Glassywing | Vernia verna | Skippers | 380 | Jun (peak) |
| 13 | Red-spotted Admiral | Limenitis arthemis | Brush-footed Butterflies | 330 | Aug (rising) |
| 14 | Eastern Comma | Polygonia comma | Brush-footed Butterflies | 328 | Aug (rising) |
| 15 | Least Skipper | Ancyloxypha numitor | Skippers | 305 | Aug (rising) |
| 16 | Banded Hairstreak | Satyrium calanus | Gossamer-winged Butterflies | 298 | Jun (peak) |
| 17 | Eastern Tailed-Blue | Everes comyntas | Gossamer-winged Butterflies | 289 | Aug (rising) |
| 18 | Peck's Skipper | Polites peckius | Skippers | 265 | Aug (rising) |
| 19 | Hobomok Skipper | Lon hobomok | Skippers | 254 | Jun (peak) |
| 20 | Mourning Cloak | Nymphalis antiopa | Brush-footed Butterflies | 249 | Apr (past peak) |
| 21 | Pearl Crescent | Phyciodes tharos | Brush-footed Butterflies | 230 | Aug (rising) |
| 22 | Hackberry Emperor | Asterocampa celtis | Brush-footed Butterflies | 228 | Aug (rising) |
| 23 | Question Mark | Polygonia interrogationis | Brush-footed Butterflies | 217 | Jul (rising) |
| 24 | Silvery Checkerspot | Chlosyne nycteis | Brush-footed Butterflies | 196 | Aug (rising) |
| 25 | Meadow Fritillary | Boloria bellona | Brush-footed Butterflies | 195 | Aug (rising) |
| 26 | American Lady | Vanessa virginiensis | Brush-footed Butterflies | 194 | Jul (rising) |
| 27 | Orange Sulphur | Colias eurytheme | Whites, Yellows, and Sulphurs | 192 | Aug (rising) |
| 28 | Essex Skipper | Thymelicus lineola | Skippers | 188 | Jun (peak) |
| 29 | Baltimore Checkerspot | Euphydryas phaeton | Brush-footed Butterflies | 163 | Jun (peak) |
| 30 | Northern Pearly-eye | Lethe anthedon | Brush-footed Butterflies | 140 | Jul (rising) |
| 31 | Appalachian Brown | Lethe appalachia | Brush-footed Butterflies | 129 | Jul (rising) |
| 32 | Common Ringlet | Coenonympha california | Brush-footed Butterflies | 121 | Jun (peak) |
| 33 | Viceroy | Limenitis archippus | Brush-footed Butterflies | 81 | Sep (rising) |
| 34 | Wild Indigo Duskywing | Erynnis baptisiae | Skippers | 76 | Aug (rising) |
| 35 | Long Dash | Limochores mystic | Skippers | 69 | Jun (peak) |
| 36 | Zebra Swallowtail | Eurytides marcellus | Swallowtails and Parnassians | 67 | Jul (rising) |
| 37 | Painted Lady | Vanessa cardui | Brush-footed Butterflies | 66 | Aug (rising) |
| 38 | Dun Skipper | Euphyes vestris | Skippers | 64 | Jul (rising) |
| 39 | Northern Broken-Dash | Polites egeremet | Skippers | 61 | Jul (rising) |
| 40 | Pipevine Swallowtail | Battus philenor | Swallowtails and Parnassians | 58 | Jul (rising) |
| 41 | Clouded Sulphur | Colias philodice | Whites, Yellows, and Sulphurs | 58 | Aug (rising) |
| 42 | American Snout | Libytheana carinenta | Brush-footed Butterflies | 57 | Jul (rising) |
| 43 | Red-banded Hairstreak | Calycopis cecrops | Gossamer-winged Butterflies | 54 | Aug (rising) |
| 44 | Gray Hairstreak | Strymon melinus | Gossamer-winged Butterflies | 49 | Aug (rising) |
| 45 | American Copper | Lycaena hypophlaeas | Gossamer-winged Butterflies | 49 | Jul (rising) |
| 46 | Common Wood-Nymph | Cercyonis pegala | Brush-footed Butterflies | 46 | Jul (rising) |
| 47 | Aphrodite Fritillary | Argynnis aphrodite | Brush-footed Butterflies | 45 | Jul (rising) |
| 48 | Atlantis Fritillary | Argynnis atlantis | Brush-footed Butterflies | 42 | Jul (rising) |
| 49 | Harvester | Feniseca tarquinius | Gossamer-winged Butterflies | 41 | Jul (rising) |
| 50 | Northern Cloudywing | Cecropterus pylades | Skippers | 41 | Jun (peak) |